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-9(-3+x)=-90
We move all terms to the left:
-9(-3+x)-(-90)=0
We add all the numbers together, and all the variables
-9(x-3)-(-90)=0
We add all the numbers together, and all the variables
-9(x-3)+90=0
We multiply parentheses
-9x+27+90=0
We add all the numbers together, and all the variables
-9x+117=0
We move all terms containing x to the left, all other terms to the right
-9x=-117
x=-117/-9
x=+13
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