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8x+9=6x-13
We move all terms to the left:
8x+9-(6x-13)=0
We get rid of parentheses
8x-6x+13+9=0
We add all the numbers together, and all the variables
2x+22=0
We move all terms containing x to the left, all other terms to the right
2x=-22
x=-22/2
x=-11
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