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90+8x=10(x+7)
We move all terms to the left:
90+8x-(10(x+7))=0
We calculate terms in parentheses: -(10(x+7)), so:We get rid of parentheses
10(x+7)
We multiply parentheses
10x+70
Back to the equation:
-(10x+70)
8x-10x-70+90=0
We add all the numbers together, and all the variables
-2x+20=0
We move all terms containing x to the left, all other terms to the right
-2x=-20
x=-20/-2
x=+10
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