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90=x+(3x+10)
We move all terms to the left:
90-(x+(3x+10))=0
We calculate terms in parentheses: -(x+(3x+10)), so:We get rid of parentheses
x+(3x+10)
We get rid of parentheses
x+3x+10
We add all the numbers together, and all the variables
4x+10
Back to the equation:
-(4x+10)
-4x-10+90=0
We add all the numbers together, and all the variables
-4x+80=0
We move all terms containing x to the left, all other terms to the right
-4x=-80
x=-80/-4
x=+20
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