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-2(-3x-10)=56
We move all terms to the left:
-2(-3x-10)-(56)=0
We multiply parentheses
6x+20-56=0
We add all the numbers together, and all the variables
6x-36=0
We move all terms containing x to the left, all other terms to the right
6x=36
x=36/6
x=6
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