13=15-4z

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Solution for 13=15-4z equation: 



13=15-4z

We move all terms to the left:

13-(15-4z)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

4z-15+13=0

We add all the numbers together, and all the variables

4z-2=0

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

4z=2

z=2/4

z=1/2

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