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2x-9=4x+8
We move all terms to the left:
2x-9-(4x+8)=0
We get rid of parentheses
2x-4x-8-9=0
We add all the numbers together, and all the variables
-2x-17=0
We move all terms containing x to the left, all other terms to the right
-2x=17
x=17/-2
x=-8+1/2
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