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13x+15=7x+75
We move all terms to the left:
13x+15-(7x+75)=0
We get rid of parentheses
13x-7x-75+15=0
We add all the numbers together, and all the variables
6x-60=0
We move all terms containing x to the left, all other terms to the right
6x=60
x=60/6
x=10
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