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8x+9=3x+15
We move all terms to the left:
8x+9-(3x+15)=0
We get rid of parentheses
8x-3x-15+9=0
We add all the numbers together, and all the variables
5x-6=0
We move all terms containing x to the left, all other terms to the right
5x=6
x=6/5
x=1+1/5
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