15=z+13

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Solution for 15=z+13 equation: 



15=z+13

We move all terms to the left:

15-(z+13)=0

We get rid of parentheses

-z-13+15=0

We add all the numbers together, and all the variables

-1z+2=0

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

-z=-2

z=-2/-1

z=+2

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