9z+4z=91

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Solution for 9z+4z=91 equation: 



9z+4z=91

We move all terms to the left:

9z+4z-(91)=0

We add all the numbers together, and all the variables

13z-91=0

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

13z=91

z=91/13

z=7

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