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-9+8x=4x+3
We move all terms to the left:
-9+8x-(4x+3)=0
We get rid of parentheses
8x-4x-3-9=0
We add all the numbers together, and all the variables
4x-12=0
We move all terms containing x to the left, all other terms to the right
4x=12
x=12/4
x=3
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