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9x+3=21+4x
We move all terms to the left:
9x+3-(21+4x)=0
We add all the numbers together, and all the variables
9x-(4x+21)+3=0
We get rid of parentheses
9x-4x-21+3=0
We add all the numbers together, and all the variables
5x-18=0
We move all terms containing x to the left, all other terms to the right
5x=18
x=18/5
x=3+3/5
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