3y+21=138

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Solution for 3y+21=138 equation: 



3y+21=138

We move all terms to the left:

3y+21-(138)=0

We add all the numbers together, and all the variables

3y-117=0

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

3y=117

y=117/3

y=39

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