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-2x+2(3x+8)=40
We move all terms to the left:
-2x+2(3x+8)-(40)=0
We multiply parentheses
-2x+6x+16-40=0
We add all the numbers together, and all the variables
4x-24=0
We move all terms containing x to the left, all other terms to the right
4x=24
x=24/4
x=6
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