12=5+z

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Solution for 12=5+z equation: 



12=5+z

We move all terms to the left:

12-(5+z)=0

We add all the numbers together, and all the variables

-(z+5)+12=0

We get rid of parentheses

-z-5+12=0

We add all the numbers together, and all the variables

-1z+7=0

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

-z=-7

z=-7/-1

z=+7

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