-12+8r+3r=7r+8r

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Solution for -12+8r+3r=7r+8r equation:


Simplifying
-12 + 8r + 3r = 7r + 8r

Combine like terms: 8r + 3r = 11r
-12 + 11r = 7r + 8r

Combine like terms: 7r + 8r = 15r
-12 + 11r = 15r

Solving
-12 + 11r = 15r

Solving for variable 'r'.

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

Add '-15r' to each side of the equation.
-12 + 11r + -15r = 15r + -15r

Combine like terms: 11r + -15r = -4r
-12 + -4r = 15r + -15r

Combine like terms: 15r + -15r = 0
-12 + -4r = 0

Add '12' to each side of the equation.
-12 + 12 + -4r = 0 + 12

Combine like terms: -12 + 12 = 0
0 + -4r = 0 + 12
-4r = 0 + 12

Combine like terms: 0 + 12 = 12
-4r = 12

Divide each side by '-4'.
r = -3

Simplifying
r = -3

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