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4x+13=8x+15
We move all terms to the left:
4x+13-(8x+15)=0
We get rid of parentheses
4x-8x-15+13=0
We add all the numbers together, and all the variables
-4x-2=0
We move all terms containing x to the left, all other terms to the right
-4x=2
x=2/-4
x=-1/2
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