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