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-3(x+2)=90
We move all terms to the left:
-3(x+2)-(90)=0
We multiply parentheses
-3x-6-90=0
We add all the numbers together, and all the variables
-3x-96=0
We move all terms containing x to the left, all other terms to the right
-3x=96
x=96/-3
x=-32
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