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90=x+(3x-6)
We move all terms to the left:
90-(x+(3x-6))=0
We calculate terms in parentheses: -(x+(3x-6)), so:We get rid of parentheses
x+(3x-6)
We get rid of parentheses
x+3x-6
We add all the numbers together, and all the variables
4x-6
Back to the equation:
-(4x-6)
-4x+6+90=0
We add all the numbers together, and all the variables
-4x+96=0
We move all terms containing x to the left, all other terms to the right
-4x=-96
x=-96/-4
x=+24
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