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-2(5x+10)=-40
We move all terms to the left:
-2(5x+10)-(-40)=0
We add all the numbers together, and all the variables
-2(5x+10)+40=0
We multiply parentheses
-10x-20+40=0
We add all the numbers together, and all the variables
-10x+20=0
We move all terms containing x to the left, all other terms to the right
-10x=-20
x=-20/-10
x=+2
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