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90=(x+15)+(5x+57)
We move all terms to the left:
90-((x+15)+(5x+57))=0
We calculate terms in parentheses: -((x+15)+(5x+57)), so:We get rid of parentheses
(x+15)+(5x+57)
We get rid of parentheses
x+5x+15+57
We add all the numbers together, and all the variables
6x+72
Back to the equation:
-(6x+72)
-6x-72+90=0
We add all the numbers together, and all the variables
-6x+18=0
We move all terms containing x to the left, all other terms to the right
-6x=-18
x=-18/-6
x=+3
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