30-3z=3(z-4)

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Solution for 30-3z=3(z-4) equation: 



30-3z=3(z-4)

We move all terms to the left:

30-3z-(3(z-4))=0



We calculate terms in parentheses: -(3(z-4)), so:

3(z-4)

We multiply parentheses

3z-12

Back to the equation:

-(3z-12)



We get rid of parentheses

-3z-3z+12+30=0

We add all the numbers together, and all the variables

-6z+42=0

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

-6z=-42

z=-42/-6

z=+7

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