8=20-3z

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Solution for 8=20-3z equation: 



8=20-3z

We move all terms to the left:

8-(20-3z)=0

We add all the numbers together, and all the variables

-(-3z+20)+8=0

We get rid of parentheses

3z-20+8=0

We add all the numbers together, and all the variables

3z-12=0

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

3z=12

z=12/3

z=4

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