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(-2x+6)=40
We move all terms to the left:
(-2x+6)-(40)=0
We get rid of parentheses
-2x+6-40=0
We add all the numbers together, and all the variables
-2x-34=0
We move all terms containing x to the left, all other terms to the right
-2x=34
x=34/-2
x=-17
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