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3x-28=-2x+21
We move all terms to the left:
3x-28-(-2x+21)=0
We get rid of parentheses
3x+2x-21-28=0
We add all the numbers together, and all the variables
5x-49=0
We move all terms containing x to the left, all other terms to the right
5x=49
x=49/5
x=9+4/5
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