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9x-(-10)=8x-13
We move all terms to the left:
9x-(-10)-(8x-13)=0
We add all the numbers together, and all the variables
9x-(8x-13)+10=0
We get rid of parentheses
9x-8x+13+10=0
We add all the numbers together, and all the variables
x+23=0
We move all terms containing x to the left, all other terms to the right
x=-23
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