3z+-7z=-20

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Solution for 3z+-7z=-20 equation: 



3z+-7z=-20

We move all terms to the left:

3z+-7z-(-20)=0

We add all the numbers together, and all the variables

-4z+20=0

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

-4z=-20

z=-20/-4

z=+5

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