33=z+21

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Solution for 33=z+21 equation: 



33=z+21

We move all terms to the left:

33-(z+21)=0

We get rid of parentheses

-z-21+33=0

We add all the numbers together, and all the variables

-1z+12=0

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

-z=-12

z=-12/-1

z=+12

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