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3(7x+7)=7(x+7)
We move all terms to the left:
3(7x+7)-(7(x+7))=0
We multiply parentheses
21x-(7(x+7))+21=0
We calculate terms in parentheses: -(7(x+7)), so:We get rid of parentheses
7(x+7)
We multiply parentheses
7x+49
Back to the equation:
-(7x+49)
21x-7x-49+21=0
We add all the numbers together, and all the variables
14x-28=0
We move all terms containing x to the left, all other terms to the right
14x=28
x=28/14
x=2
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