12+z=9+7

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Solution for 12+z=9+7 equation: 



12+z=9+7

We move all terms to the left:

12+z-(9+7)=0

We add all the numbers together, and all the variables

z+12-16=0

We add all the numbers together, and all the variables

z-4=0

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

z=4

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