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7x-13=5x-15
We move all terms to the left:
7x-13-(5x-15)=0
We get rid of parentheses
7x-5x+15-13=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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