The adjective would be insoluble, unsolvable, or impossible.
This coulld be a "panacea" (cure-all)
1. a remedy for all disease or ills; a cure-all,
2. an answer or solution for all problems or difficulties.
"panacea"
"panacea"
Use the equation, speed = distance / time, substitute in the given information from the problem and solve it.
A verb meaning to make easier is facilitate.One meaning to make less complex is simplify.
Sportsmanship is a word substitute for spirit of game
There is no one-word substitute in English for "son-in-law."
A word substitute for the sentence "A fault that can be forgiven" is "venial".
The opposite of a problem (challenge, difficulty) could be a solution, answer, or fix.The opposite of the adjective problem could be easy, facile, or effortless.
One possible substitute for "their" is "his" or "her" depending on the gender of the person/people being referred to. Another substitute can be "its" when referring to a non-human object or entity.
By definition, an equation has a solution. The word comes from "equal". Some mathematical problems do not have solutions. For example, 1/0 = X is a problem with no solution. You know, in this example that there is no solution because of the "divide by zero" rule. Most insoluble problems are insoluble because of some rule that keeps you from moving ahead.
In the game of Scrabble, you can use the word "exert" as a substitute for "apply effort".
The word you want is florist.
Yes, the word 'substitute' is a noun, a singular, common, abstract noun; a word for someone or something that takes the place of another. The word 'substitute' is also a verb (substitute, substitutes, substituting, substituted). Examples:Noun: Salsa is a good substitute for tomatoes in a sandwich.Verb: Ms. Lincoln will substitute for Ms. Washington while she is on her honeymoon.