15=45+z

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Solution for 15=45+z equation: 



15=45+z

We move all terms to the left:

15-(45+z)=0

We add all the numbers together, and all the variables

-(z+45)+15=0

We get rid of parentheses

-z-45+15=0

We add all the numbers together, and all the variables

-1z-30=0

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

-z=30

z=30/-1

z=-30

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