z^2+4z=z^2+20

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Solution for z^2+4z=z^2+20 equation: 



z^2+4z=z^2+20

We move all terms to the left:

z^2+4z-(z^2+20)=0

We get rid of parentheses

z^2-z^2+4z-20=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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