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3(2x-7)-(x+3)=-66
We move all terms to the left:
3(2x-7)-(x+3)-(-66)=0
We add all the numbers together, and all the variables
3(2x-7)-(x+3)+66=0
We multiply parentheses
6x-(x+3)-21+66=0
We get rid of parentheses
6x-x-3-21+66=0
We add all the numbers together, and all the variables
5x+42=0
We move all terms containing x to the left, all other terms to the right
5x=-42
x=-42/5
x=-8+2/5
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