4=-2+-2z

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Solution for 4=-2+-2z equation: 



4=-2+-2z

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(-2z)+4=0

We get rid of parentheses

2z+4=0

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

2z=-4

z=-4/2

z=-2

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