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-2(x+6)-2(-5x-2)=40
We move all terms to the left:
-2(x+6)-2(-5x-2)-(40)=0
We multiply parentheses
-2x+10x-12+4-40=0
We add all the numbers together, and all the variables
8x-48=0
We move all terms containing x to the left, all other terms to the right
8x=48
x=48/8
x=6
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