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15x-7=3x+9
We move all terms to the left:
15x-7-(3x+9)=0
We get rid of parentheses
15x-3x-9-7=0
We add all the numbers together, and all the variables
12x-16=0
We move all terms containing x to the left, all other terms to the right
12x=16
x=16/12
x=1+1/3
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