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4x+3=21-2x*
We move all terms to the left:
4x+3-(21-2x*)=0
We add all the numbers together, and all the variables
4x-(-2x*+21)+3=0
We get rid of parentheses
4x+2x*-21+3=0
We add all the numbers together, and all the variables
4x+2x*-18=0
We move all terms containing x to the left, all other terms to the right
4x+2x*=18
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