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9x-139=2x-6
We move all terms to the left:
9x-139-(2x-6)=0
We get rid of parentheses
9x-2x+6-139=0
We add all the numbers together, and all the variables
7x-133=0
We move all terms containing x to the left, all other terms to the right
7x=133
x=133/7
x=19
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