4=z2.

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Solution for 4=z2. equation: 



4=z2.

We move all terms to the left:

4-(z2.)=0

We add all the numbers together, and all the variables

-(+z2.)+4=0

We get rid of parentheses

-z2.+4=0

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

-z2.=-4

z=-4/1

z=-4

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