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40=5x+2(x-8)
We move all terms to the left:
40-(5x+2(x-8))=0
We calculate terms in parentheses: -(5x+2(x-8)), so:We get rid of parentheses
5x+2(x-8)
We multiply parentheses
5x+2x-16
We add all the numbers together, and all the variables
7x-16
Back to the equation:
-(7x-16)
-7x+16+40=0
We add all the numbers together, and all the variables
-7x+56=0
We move all terms containing x to the left, all other terms to the right
-7x=-56
x=-56/-7
x=+8
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