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2(5x+2x)-2=66
We move all terms to the left:
2(5x+2x)-2-(66)=0
We add all the numbers together, and all the variables
2(+7x)-2-66=0
We add all the numbers together, and all the variables
2(+7x)-68=0
We multiply parentheses
14x-68=0
We move all terms containing x to the left, all other terms to the right
14x=68
x=68/14
x=4+6/7
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