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90=x-4-3x-2
We move all terms to the left:
90-(x-4-3x-2)=0
We add all the numbers together, and all the variables
-(-2x-6)+90=0
We get rid of parentheses
2x+6+90=0
We add all the numbers together, and all the variables
2x+96=0
We move all terms containing x to the left, all other terms to the right
2x=-96
x=-96/2
x=-48
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