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15x-21=9x+1
We move all terms to the left:
15x-21-(9x+1)=0
We get rid of parentheses
15x-9x-1-21=0
We add all the numbers together, and all the variables
6x-22=0
We move all terms containing x to the left, all other terms to the right
6x=22
x=22/6
x=3+2/3
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