-156=-3.9r

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Solution for -156=-3.9r equation: 



-156=-3.9r

We move all terms to the left:

-156-(-3.9r)=0

We get rid of parentheses

3.9r-156=0

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

3.9r=156

r=156/3.9

r=40

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