-7z+12=-9-4z

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Solution for -7z+12=-9-4z equation: 



-7z+12=-9-4z

We move all terms to the left:

-7z+12-(-9-4z)=0

We add all the numbers together, and all the variables

-7z-(-4z-9)+12=0

We get rid of parentheses

-7z+4z+9+12=0

We add all the numbers together, and all the variables

-3z+21=0

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

-3z=-21

z=-21/-3

z=+7

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