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3x-9x+8=4x-9
We move all terms to the left:
3x-9x+8-(4x-9)=0
We add all the numbers together, and all the variables
-6x-(4x-9)+8=0
We get rid of parentheses
-6x-4x+9+8=0
We add all the numbers together, and all the variables
-10x+17=0
We move all terms containing x to the left, all other terms to the right
-10x=-17
x=-17/-10
x=1+7/10
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