7z-21+z+4=15

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Solution for 7z-21+z+4=15 equation: 



7z-21+z+4=15

We move all terms to the left:

7z-21+z+4-(15)=0

We add all the numbers together, and all the variables

8z-32=0

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

8z=32

z=32/8

z=4

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