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5x+8=-4x-9
We move all terms to the left:
5x+8-(-4x-9)=0
We get rid of parentheses
5x+4x+9+8=0
We add all the numbers together, and all the variables
9x+17=0
We move all terms containing x to the left, all other terms to the right
9x=-17
x=-17/9
x=-1+8/9
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