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8x+9=-6x+1577
We move all terms to the left:
8x+9-(-6x+1577)=0
We get rid of parentheses
8x+6x-1577+9=0
We add all the numbers together, and all the variables
14x-1568=0
We move all terms containing x to the left, all other terms to the right
14x=1568
x=1568/14
x=112
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