-20z=-180

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Solution for -20z=-180 equation: 



-20z=-180

We move all terms to the left:

-20z-(-180)=0

We add all the numbers together, and all the variables

-20z+180=0

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

-20z=-180

z=-180/-20

z=+9

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