15=7z-3z

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Solution for 15=7z-3z equation: 



15=7z-3z

We move all terms to the left:

15-(7z-3z)=0

We add all the numbers together, and all the variables

-(+4z)+15=0

We get rid of parentheses

-4z+15=0

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

-4z=-15

z=-15/-4

z=3+3/4

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