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13+x=7x+15
We move all terms to the left:
13+x-(7x+15)=0
We get rid of parentheses
x-7x-15+13=0
We add all the numbers together, and all the variables
-6x-2=0
We move all terms containing x to the left, all other terms to the right
-6x=2
x=2/-6
x=-1/3
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