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90=(2x+8)+(4x+4)
We move all terms to the left:
90-((2x+8)+(4x+4))=0
We calculate terms in parentheses: -((2x+8)+(4x+4)), so:We get rid of parentheses
(2x+8)+(4x+4)
We get rid of parentheses
2x+4x+8+4
We add all the numbers together, and all the variables
6x+12
Back to the equation:
-(6x+12)
-6x-12+90=0
We add all the numbers together, and all the variables
-6x+78=0
We move all terms containing x to the left, all other terms to the right
-6x=-78
x=-78/-6
x=+13
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