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15x-11=7x+13
We move all terms to the left:
15x-11-(7x+13)=0
We get rid of parentheses
15x-7x-13-11=0
We add all the numbers together, and all the variables
8x-24=0
We move all terms containing x to the left, all other terms to the right
8x=24
x=24/8
x=3
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