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-4(8-x)+3x=-21=
We move all terms to the left:
-4(8-x)+3x-(-21)=0
We add all the numbers together, and all the variables
-4(-1x+8)+3x-(-21)=0
We add all the numbers together, and all the variables
3x-4(-1x+8)+21=0
We multiply parentheses
3x+4x-32+21=0
We add all the numbers together, and all the variables
7x-11=0
We move all terms containing x to the left, all other terms to the right
7x=11
x=11/7
x=1+4/7
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