-18=z+3z

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Solution for -18=z+3z equation: 



-18=z+3z

We move all terms to the left:

-18-(z+3z)=0

We add all the numbers together, and all the variables

-(+4z)-18=0

We get rid of parentheses

-4z-18=0

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

-4z=18

z=18/-4

z=-4+1/2

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