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9x-20=3x-10
We move all terms to the left:
9x-20-(3x-10)=0
We get rid of parentheses
9x-3x+10-20=0
We add all the numbers together, and all the variables
6x-10=0
We move all terms containing x to the left, all other terms to the right
6x=10
x=10/6
x=1+2/3
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