If we're talking strictly algebra. 12 equals p of c can be written as: 12= p(c) meaning, 12 is the answer for some function p, when c is the variable.
If you mean C = 5h-2 then C = (5*12)-2 => 58
If you mean: -12 = 3c-9 then c works out as -1
12°F = -11.1°C: (12°F - 32) multiplied by 5/9 = -11.1°C
12 days of christmas
12 Picture cards in a deck
12 sides on a fifty cent piece? (Australian)
-12 + c = 19 Add 12 to both sides: c = 19+12 = 31
12 (c-8) = 4
It is c + 12.
An organism stops taking in carbon when it dies.
12 deg C = 261.15 K