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15x+9=8x-2
We move all terms to the left:
15x+9-(8x-2)=0
We get rid of parentheses
15x-8x+2+9=0
We add all the numbers together, and all the variables
7x+11=0
We move all terms containing x to the left, all other terms to the right
7x=-11
x=-11/7
x=-1+4/7
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