0
-6r-5 = 7-12r
12r-6r = 7+5
6r = 12
r = 2
5 - 710 - 6r = -93-705 - 6r = -93
705 + 6r = 93
6r = 93 - 705 = -612
r = -612/6 = -102
The 'solution' is the number that 'r' must be in order to make the statement true.
Here's how to find it:
6r - 1 + 6r = 11
Add 1 to each side:
6r + 6r = 12
Clean up the left side:
12r = 12
Divide each side by 12:
r = 1
yes they did, but 6s get to have it too because 6r are kind. (but 6r did win)
6r * 5r^2
= 30r^3
------------
multiply the bases and add the exponents ( 6r is really 6r^1, but the implied 1 is never written as mathematical convention )