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13+5x=8(x-1)
We move all terms to the left:
13+5x-(8(x-1))=0
We calculate terms in parentheses: -(8(x-1)), so:We get rid of parentheses
8(x-1)
We multiply parentheses
8x-8
Back to the equation:
-(8x-8)
5x-8x+8+13=0
We add all the numbers together, and all the variables
-3x+21=0
We move all terms containing x to the left, all other terms to the right
-3x=-21
x=-21/-3
x=+7
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