-7z=30+3z

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Solution for -7z=30+3z equation: 



-7z=30+3z

We move all terms to the left:

-7z-(30+3z)=0

We add all the numbers together, and all the variables

-7z-(3z+30)=0

We get rid of parentheses

-7z-3z-30=0

We add all the numbers together, and all the variables

-10z-30=0

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

-10z=30

z=30/-10

z=-3

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