21=2z+3

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Solution for 21=2z+3 equation: 



21=2z+3

We move all terms to the left:

21-(2z+3)=0

We get rid of parentheses

-2z-3+21=0

We add all the numbers together, and all the variables

-2z+18=0

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

-2z=-18

z=-18/-2

z=+9

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