18r-9r=-108

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Solution for 18r-9r=-108 equation: 


Simplifying
18r + -9r = -108

Combine like terms: 18r + -9r = 9r
9r = -108

Solving
9r = -108

Solving for variable 'r'.

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

Divide each side by '9'.
r = -12

Simplifying
r = -12

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