z+2(z-3)=15

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Solution for z+2(z-3)=15 equation: 



z+2(z-3)=15

We move all terms to the left:

z+2(z-3)-(15)=0

We multiply parentheses

z+2z-6-15=0

We add all the numbers together, and all the variables

3z-21=0

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

3z=21

z=21/3

z=7

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