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90=5x+(x+54)
We move all terms to the left:
90-(5x+(x+54))=0
We calculate terms in parentheses: -(5x+(x+54)), so:We get rid of parentheses
5x+(x+54)
We get rid of parentheses
5x+x+54
We add all the numbers together, and all the variables
6x+54
Back to the equation:
-(6x+54)
-6x-54+90=0
We add all the numbers together, and all the variables
-6x+36=0
We move all terms containing x to the left, all other terms to the right
-6x=-36
x=-36/-6
x=+6
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