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-2(-10+x)=40
We move all terms to the left:
-2(-10+x)-(40)=0
We add all the numbers together, and all the variables
-2(x-10)-40=0
We multiply parentheses
-2x+20-40=0
We add all the numbers together, and all the variables
-2x-20=0
We move all terms containing x to the left, all other terms to the right
-2x=20
x=20/-2
x=-10
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