12r-3r=-90

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Solution for 12r-3r=-90 equation: 


Simplifying
12r + -3r = -90

Combine like terms: 12r + -3r = 9r
9r = -90

Solving
9r = -90

Solving for variable 'r'.

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

Divide each side by '9'.
r = -10

Simplifying
r = -10

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