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6x-(2x+4)=2x-40
We move all terms to the left:
6x-(2x+4)-(2x-40)=0
We get rid of parentheses
6x-2x-2x-4+40=0
We add all the numbers together, and all the variables
2x+36=0
We move all terms containing x to the left, all other terms to the right
2x=-36
x=-36/2
x=-18
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