20=-10+0.5z

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Solution for 20=-10+0.5z equation: 



20=-10+0.5z

We move all terms to the left:

20-(-10+0.5z)=0

We add all the numbers together, and all the variables

-(0.5z-10)+20=0

We get rid of parentheses

-0.5z+10+20=0

We add all the numbers together, and all the variables

-0.5z+30=0

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

-0.5z=-30

z=-30/-0.5

z=+60

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