12-2r=20

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Solution for 12-2r=20 equation: 


Simplifying
12 + -2r = 20

Solving
12 + -2r = 20

Solving for variable 'r'.

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

Add '-12' to each side of the equation.
12 + -12 + -2r = 20 + -12

Combine like terms: 12 + -12 = 0
0 + -2r = 20 + -12
-2r = 20 + -12

Combine like terms: 20 + -12 = 8
-2r = 8

Divide each side by '-2'.
r = -4

Simplifying
r = -4

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