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(2x)+(x+2)+(x-4)=66
We move all terms to the left:
(2x)+(x+2)+(x-4)-(66)=0
We get rid of parentheses
2x+x+x+2-4-66=0
We add all the numbers together, and all the variables
4x-68=0
We move all terms containing x to the left, all other terms to the right
4x=68
x=68/4
x=17
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