15=z+4z

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Solution for 15=z+4z equation: 



15=z+4z

We move all terms to the left:

15-(z+4z)=0

We add all the numbers together, and all the variables

-(+5z)+15=0

We get rid of parentheses

-5z+15=0

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

-5z=-15

z=-15/-5

z=+3

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