7z-4z=-9

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Solution for 7z-4z=-9 equation: 



7z-4z=-9

We move all terms to the left:

7z-4z-(-9)=0

We add all the numbers together, and all the variables

3z+9=0

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

3z=-9

z=-9/3

z=-3

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