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90=2(5-5x)
We move all terms to the left:
90-(2(5-5x))=0
We add all the numbers together, and all the variables
-(2(-5x+5))+90=0
We calculate terms in parentheses: -(2(-5x+5)), so:We get rid of parentheses
2(-5x+5)
We multiply parentheses
-10x+10
Back to the equation:
-(-10x+10)
10x-10+90=0
We add all the numbers together, and all the variables
10x+80=0
We move all terms containing x to the left, all other terms to the right
10x=-80
x=-80/10
x=-8
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