13=4+z

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Solution for 13=4+z equation: 



13=4+z

We move all terms to the left:

13-(4+z)=0

We add all the numbers together, and all the variables

-(z+4)+13=0

We get rid of parentheses

-z-4+13=0

We add all the numbers together, and all the variables

-1z+9=0

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

-z=-9

z=-9/-1

z=+9

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