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