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4-5x=8x-9
We move all terms to the left:
4-5x-(8x-9)=0
We get rid of parentheses
-5x-8x+9+4=0
We add all the numbers together, and all the variables
-13x+13=0
We move all terms containing x to the left, all other terms to the right
-13x=-13
x=-13/-13
x=1
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