3=21-2z

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Solution for 3=21-2z equation: 



3=21-2z

We move all terms to the left:

3-(21-2z)=0

We add all the numbers together, and all the variables

-(-2z+21)+3=0

We get rid of parentheses

2z-21+3=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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