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7(x+3)-51=x+6
We move all terms to the left:
7(x+3)-51-(x+6)=0
We multiply parentheses
7x-(x+6)+21-51=0
We get rid of parentheses
7x-x-6+21-51=0
We add all the numbers together, and all the variables
6x-36=0
We move all terms containing x to the left, all other terms to the right
6x=36
x=36/6
x=6
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