z-15=-4z

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Solution for z-15=-4z equation: 



z-15=-4z

We move all terms to the left:

z-15-(-4z)=0

We get rid of parentheses

z+4z-15=0

We add all the numbers together, and all the variables

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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