21z-3=3z+6

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Solution for 21z-3=3z+6 equation: 



21z-3=3z+6

We move all terms to the left:

21z-3-(3z+6)=0

We get rid of parentheses

21z-3z-6-3=0

We add all the numbers together, and all the variables

18z-9=0

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

18z=9

z=9/18

z=1/2

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