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-24=-3x+21
We move all terms to the left:
-24-(-3x+21)=0
We get rid of parentheses
3x-21-24=0
We add all the numbers together, and all the variables
3x-45=0
We move all terms containing x to the left, all other terms to the right
3x=45
x=45/3
x=15
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