(3n-3)=-90

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Solution for (3n-3)=-90 equation: 



(3n-3)=-90

We move all terms to the left:

(3n-3)-(-90)=0

We add all the numbers together, and all the variables

(3n-3)+90=0

We get rid of parentheses

3n-3+90=0

We add all the numbers together, and all the variables

3n+87=0

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

3n=-87

n=-87/3

n=-29

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