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4(-3x+3)-3x=-21-4x
We move all terms to the left:
4(-3x+3)-3x-(-21-4x)=0
We add all the numbers together, and all the variables
4(-3x+3)-3x-(-4x-21)=0
We add all the numbers together, and all the variables
-3x+4(-3x+3)-(-4x-21)=0
We multiply parentheses
-3x-12x-(-4x-21)+12=0
We get rid of parentheses
-3x-12x+4x+21+12=0
We add all the numbers together, and all the variables
-11x+33=0
We move all terms containing x to the left, all other terms to the right
-11x=-33
x=-33/-11
x=+3
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