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42=7(x+10)
We move all terms to the left:
42-(7(x+10))=0
We calculate terms in parentheses: -(7(x+10)), so:We get rid of parentheses
7(x+10)
We multiply parentheses
7x+70
Back to the equation:
-(7x+70)
-7x-70+42=0
We add all the numbers together, and all the variables
-7x-28=0
We move all terms containing x to the left, all other terms to the right
-7x=28
x=28/-7
x=-4
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