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