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102=6x+3(x+13)
We move all terms to the left:
102-(6x+3(x+13))=0
We calculate terms in parentheses: -(6x+3(x+13)), so:We get rid of parentheses
6x+3(x+13)
We multiply parentheses
6x+3x+39
We add all the numbers together, and all the variables
9x+39
Back to the equation:
-(9x+39)
-9x-39+102=0
We add all the numbers together, and all the variables
-9x+63=0
We move all terms containing x to the left, all other terms to the right
-9x=-63
x=-63/-9
x=+7
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