-z-12=-3z

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Solution for -z-12=-3z equation: 



-z-12=-3z

We move all terms to the left:

-z-12-(-3z)=0

We add all the numbers together, and all the variables

-1z-(-3z)-12=0

We get rid of parentheses

-1z+3z-12=0

We add all the numbers together, and all the variables

2z-12=0

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

2z=12

z=12/2

z=6

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