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13+15x=5x+7
We move all terms to the left:
13+15x-(5x+7)=0
We get rid of parentheses
15x-5x-7+13=0
We add all the numbers together, and all the variables
10x+6=0
We move all terms containing x to the left, all other terms to the right
10x=-6
x=-6/10
x=-3/5
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