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8x+9=4x+23=
We move all terms to the left:
8x+9-(4x+23)=0
We get rid of parentheses
8x-4x-23+9=0
We add all the numbers together, and all the variables
4x-14=0
We move all terms containing x to the left, all other terms to the right
4x=14
x=14/4
x=3+1/2
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