-20=12+8r

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Solution for -20=12+8r equation:


Simplifying
-20 = 12 + 8r

Solving
-20 = 12 + 8r

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '-8r' to each side of the equation.
-20 + -8r = 12 + 8r + -8r

Combine like terms: 8r + -8r = 0
-20 + -8r = 12 + 0
-20 + -8r = 12

Add '20' to each side of the equation.
-20 + 20 + -8r = 12 + 20

Combine like terms: -20 + 20 = 0
0 + -8r = 12 + 20
-8r = 12 + 20

Combine like terms: 12 + 20 = 32
-8r = 32

Divide each side by '-8'.
r = -4

Simplifying
r = -4

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