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-(x+3)-4(2x+1)=56
We move all terms to the left:
-(x+3)-4(2x+1)-(56)=0
We multiply parentheses
-(x+3)-8x-4-56=0
We get rid of parentheses
-x-8x-3-4-56=0
We add all the numbers together, and all the variables
-9x-63=0
We move all terms containing x to the left, all other terms to the right
-9x=63
x=63/-9
x=-7
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