z+7=4z-20

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Solution for z+7=4z-20 equation: 



z+7=4z-20

We move all terms to the left:

z+7-(4z-20)=0

We get rid of parentheses

z-4z+20+7=0

We add all the numbers together, and all the variables

-3z+27=0

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

-3z=-27

z=-27/-3

z=+9

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