3r+6(r-3)=-90

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Solution for 3r+6(r-3)=-90 equation: 



3r+6(r-3)=-90

We move all terms to the left:

3r+6(r-3)-(-90)=0

We add all the numbers together, and all the variables

3r+6(r-3)+90=0

We multiply parentheses

3r+6r-18+90=0

We add all the numbers together, and all the variables

9r+72=0

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

9r=-72

r=-72/9

r=-8

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