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7(x-7)=8(x-5)
We move all terms to the left:
7(x-7)-(8(x-5))=0
We multiply parentheses
7x-(8(x-5))-49=0
We calculate terms in parentheses: -(8(x-5)), so:We get rid of parentheses
8(x-5)
We multiply parentheses
8x-40
Back to the equation:
-(8x-40)
7x-8x+40-49=0
We add all the numbers together, and all the variables
-1x-9=0
We move all terms containing x to the left, all other terms to the right
-x=9
x=9/-1
x=-9
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