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10(x+3)=9(x+7)
We move all terms to the left:
10(x+3)-(9(x+7))=0
We multiply parentheses
10x-(9(x+7))+30=0
We calculate terms in parentheses: -(9(x+7)), so:We get rid of parentheses
9(x+7)
We multiply parentheses
9x+63
Back to the equation:
-(9x+63)
10x-9x-63+30=0
We add all the numbers together, and all the variables
x-33=0
We move all terms containing x to the left, all other terms to the right
x=33
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