4z+15=9z-20

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Solution for 4z+15=9z-20 equation: 



4z+15=9z-20

We move all terms to the left:

4z+15-(9z-20)=0

We get rid of parentheses

4z-9z+20+15=0

We add all the numbers together, and all the variables

-5z+35=0

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

-5z=-35

z=-35/-5

z=+7

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