31=4+9z

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Solution for 31=4+9z equation: 



31=4+9z

We move all terms to the left:

31-(4+9z)=0

We add all the numbers together, and all the variables

-(9z+4)+31=0

We get rid of parentheses

-9z-4+31=0

We add all the numbers together, and all the variables

-9z+27=0

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

-9z=-27

z=-27/-9

z=+3

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