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3(-4x-5)=21
We move all terms to the left:
3(-4x-5)-(21)=0
We multiply parentheses
-12x-15-21=0
We add all the numbers together, and all the variables
-12x-36=0
We move all terms containing x to the left, all other terms to the right
-12x=36
x=36/-12
x=-3
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