3y-18=21

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Solution for 3y-18=21 equation: 



3y-18=21

We move all terms to the left:

3y-18-(21)=0

We add all the numbers together, and all the variables

3y-39=0

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

3y=39

y=39/3

y=13

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