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15x-7=28x-9
We move all terms to the left:
15x-7-(28x-9)=0
We get rid of parentheses
15x-28x+9-7=0
We add all the numbers together, and all the variables
-13x+2=0
We move all terms containing x to the left, all other terms to the right
-13x=-2
x=-2/-13
x=2/13
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