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10x-(8x-9)=13
We move all terms to the left:
10x-(8x-9)-(13)=0
We get rid of parentheses
10x-8x+9-13=0
We add all the numbers together, and all the variables
2x-4=0
We move all terms containing x to the left, all other terms to the right
2x=4
x=4/2
x=2
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