84=4z+3z

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Solution for 84=4z+3z equation: 



84=4z+3z

We move all terms to the left:

84-(4z+3z)=0

We add all the numbers together, and all the variables

-(+7z)+84=0

We get rid of parentheses

-7z+84=0

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

-7z=-84

z=-84/-7

z=+12

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