4z+5z=90

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Solution for 4z+5z=90 equation: 



4z+5z=90

We move all terms to the left:

4z+5z-(90)=0

We add all the numbers together, and all the variables

9z-90=0

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

9z=90

z=90/9

z=10

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