3z+18=21

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Solution for 3z+18=21 equation: 



3z+18=21

We move all terms to the left:

3z+18-(21)=0

We add all the numbers together, and all the variables

3z-3=0

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

3z=3

z=3/3

z=1

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