(-13r)+r-8r=12

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Solution for (-13r)+r-8r=12 equation: 


Simplifying
(-13r) + r + -8r = 12

Combine like terms: (-13r) + r = -12r
-12r + -8r = 12

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

Solving
-20r = 12

Solving for variable 'r'.

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

Divide each side by '-20'.
r = -0.6

Simplifying
r = -0.6

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