15=13-4s

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Solution for 15=13-4s equation: 



15=13-4s

We move all terms to the left:

15-(13-4s)=0

We add all the numbers together, and all the variables

-(-4s+13)+15=0

We get rid of parentheses

4s-13+15=0

We add all the numbers together, and all the variables

4s+2=0

We move all terms containing s to the left, all other terms to the right

4s=-2

s=-2/4

s=-1/2

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