9z-(-7z)-20z+(-13z)=12

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Solution for 9z-(-7z)-20z+(-13z)=12 equation: 



9z-(-7z)-20z+(-13z)=12

We move all terms to the left:

9z-(-7z)-20z+(-13z)-(12)=0

We add all the numbers together, and all the variables

-11z-(-7z)+(-13z)-12=0

We get rid of parentheses

-11z+7z-13z-12=0

We add all the numbers together, and all the variables

-17z-12=0

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

-17z=12

z=12/-17

z=-12/17

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