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15x-20=9x-2
We move all terms to the left:
15x-20-(9x-2)=0
We get rid of parentheses
15x-9x+2-20=0
We add all the numbers together, and all the variables
6x-18=0
We move all terms containing x to the left, all other terms to the right
6x=18
x=18/6
x=3
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