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7x-(x+6)+2x=18
We move all terms to the left:
7x-(x+6)+2x-(18)=0
We add all the numbers together, and all the variables
9x-(x+6)-18=0
We get rid of parentheses
9x-x-6-18=0
We add all the numbers together, and all the variables
8x-24=0
We move all terms containing x to the left, all other terms to the right
8x=24
x=24/8
x=3
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