z=21-2.5z

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Solution for z=21-2.5z equation: 



z=21-2.5z

We move all terms to the left:

z-(21-2.5z)=0

We add all the numbers together, and all the variables

z-(-2.5z+21)=0

We get rid of parentheses

z+2.5z-21=0

We add all the numbers together, and all the variables

3.5z-21=0

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

3.5z=21

z=21/3.5

z=6

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