21=17+z/3

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Solution for 21=17+z/3 equation: 



21=17+z/3

We move all terms to the left:

21-(17+z/3)=0

We add all the numbers together, and all the variables

-(z/3+17)+21=0

We get rid of parentheses

-z/3-17+21=0

We multiply all the terms by the denominator


-z-17*3+21*3=0

We add all the numbers together, and all the variables

-1z+12=0

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

-z=-12

z=-12/-1

z=+12

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