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15x-7=13x-9
We move all terms to the left:
15x-7-(13x-9)=0
We get rid of parentheses
15x-13x+9-7=0
We add all the numbers together, and all the variables
2x+2=0
We move all terms containing x to the left, all other terms to the right
2x=-2
x=-2/2
x=-1
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