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9x+6=2(5x+21)
We move all terms to the left:
9x+6-(2(5x+21))=0
We calculate terms in parentheses: -(2(5x+21)), so:We get rid of parentheses
2(5x+21)
We multiply parentheses
10x+42
Back to the equation:
-(10x+42)
9x-10x-42+6=0
We add all the numbers together, and all the variables
-1x-36=0
We move all terms containing x to the left, all other terms to the right
-x=36
x=36/-1
x=-36
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