12+7z-15z+3=-9

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Solution for 12+7z-15z+3=-9 equation: 



12+7z-15z+3=-9

We move all terms to the left:

12+7z-15z+3-(-9)=0

We add all the numbers together, and all the variables

-8z+24=0

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

-8z=-24

z=-24/-8

z=+3

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