7=21z+3

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Solution for 7=21z+3 equation: 



7=21z+3

We move all terms to the left:

7-(21z+3)=0

We get rid of parentheses

-21z-3+7=0

We add all the numbers together, and all the variables

-21z+4=0

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

-21z=-4

z=-4/-21

z=4/21

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