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9x+13=6x-8
We move all terms to the left:
9x+13-(6x-8)=0
We get rid of parentheses
9x-6x+8+13=0
We add all the numbers together, and all the variables
3x+21=0
We move all terms containing x to the left, all other terms to the right
3x=-21
x=-21/3
x=-7
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