31-7z=3(z-3)

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Solution for 31-7z=3(z-3) equation: 



31-7z=3(z-3)

We move all terms to the left:

31-7z-(3(z-3))=0



We calculate terms in parentheses: -(3(z-3)), so:

3(z-3)

We multiply parentheses

3z-9

Back to the equation:

-(3z-9)



We get rid of parentheses

-7z-3z+9+31=0

We add all the numbers together, and all the variables

-10z+40=0

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

-10z=-40

z=-40/-10

z=+4

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