1=21-4z

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Solution for 1=21-4z equation: 



1=21-4z

We move all terms to the left:

1-(21-4z)=0

We add all the numbers together, and all the variables

-(-4z+21)+1=0

We get rid of parentheses

4z-21+1=0

We add all the numbers together, and all the variables

4z-20=0

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

4z=20

z=20/4

z=5

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