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2x+12=21-3x
We move all terms to the left:
2x+12-(21-3x)=0
We add all the numbers together, and all the variables
2x-(-3x+21)+12=0
We get rid of parentheses
2x+3x-21+12=0
We add all the numbers together, and all the variables
5x-9=0
We move all terms containing x to the left, all other terms to the right
5x=9
x=9/5
x=1+4/5
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