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15x-8=50x+13
We move all terms to the left:
15x-8-(50x+13)=0
We get rid of parentheses
15x-50x-13-8=0
We add all the numbers together, and all the variables
-35x-21=0
We move all terms containing x to the left, all other terms to the right
-35x=21
x=21/-35
x=-3/5
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