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20x-6=7x+9
We move all terms to the left:
20x-6-(7x+9)=0
We get rid of parentheses
20x-7x-9-6=0
We add all the numbers together, and all the variables
13x-15=0
We move all terms containing x to the left, all other terms to the right
13x=15
x=15/13
x=1+2/13
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