15=3(z+1)

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Solution for 15=3(z+1) equation: 



15=3(z+1)

We move all terms to the left:

15-(3(z+1))=0



We calculate terms in parentheses: -(3(z+1)), so:

3(z+1)

We multiply parentheses

3z+3

Back to the equation:

-(3z+3)



We get rid of parentheses

-3z-3+15=0

We add all the numbers together, and all the variables

-3z+12=0

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

-3z=-12

z=-12/-3

z=+4

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