20z-9z+4z-12z+2z=15

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Solution for 20z-9z+4z-12z+2z=15 equation: 



20z-9z+4z-12z+2z=15

We move all terms to the left:

20z-9z+4z-12z+2z-(15)=0

We add all the numbers together, and all the variables

5z-15=0

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

5z=15

z=15/5

z=3

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