-0.5z=-20

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Solution for -0.5z=-20 equation: 



-0.5z=-20

We move all terms to the left:

-0.5z-(-20)=0

We add all the numbers together, and all the variables

-0.5z+20=0

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

-0.5z=-20

z=-20/-0.5

z=+40

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