-31=-5z+9z

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Solution for -31=-5z+9z equation: 



-31=-5z+9z

We move all terms to the left:

-31-(-5z+9z)=0

We add all the numbers together, and all the variables

-(+4z)-31=0

We get rid of parentheses

-4z-31=0

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

-4z=31

z=31/-4

z=-7+3/4

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