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-2x-3(-x-11)=21
We move all terms to the left:
-2x-3(-x-11)-(21)=0
We add all the numbers together, and all the variables
-2x-3(-1x-11)-21=0
We multiply parentheses
-2x+3x+33-21=0
We add all the numbers together, and all the variables
x+12=0
We move all terms containing x to the left, all other terms to the right
x=-12
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