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8x+x-3=-3x+21
We move all terms to the left:
8x+x-3-(-3x+21)=0
We add all the numbers together, and all the variables
9x-(-3x+21)-3=0
We get rid of parentheses
9x+3x-21-3=0
We add all the numbers together, and all the variables
12x-24=0
We move all terms containing x to the left, all other terms to the right
12x=24
x=24/12
x=2
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