-90=6r-12

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Solution for -90=6r-12 equation: 



-90=6r-12

We move all terms to the left:

-90-(6r-12)=0

We get rid of parentheses

-6r+12-90=0

We add all the numbers together, and all the variables

-6r-78=0

We move all terms containing r to the left, all other terms to the right

-6r=78

r=78/-6

r=-13

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