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2(3x+2)+2(4x-2)=140
We move all terms to the left:
2(3x+2)+2(4x-2)-(140)=0
We multiply parentheses
6x+8x+4-4-140=0
We add all the numbers together, and all the variables
14x-140=0
We move all terms containing x to the left, all other terms to the right
14x=140
x=140/14
x=10
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