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9x-43=3x+21
We move all terms to the left:
9x-43-(3x+21)=0
We get rid of parentheses
9x-3x-21-43=0
We add all the numbers together, and all the variables
6x-64=0
We move all terms containing x to the left, all other terms to the right
6x=64
x=64/6
x=10+2/3
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