18y-21=15y+3*

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Solution for 18y-21=15y+3* equation: 



18y-21=15y+3*

We move all terms to the left:

18y-21-(15y+3*)=0

We add all the numbers together, and all the variables

18y-(+15y)-21=0

We get rid of parentheses

18y-15y-21=0

We add all the numbers together, and all the variables

3y-21=0

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

3y=21

y=21/3

y=7

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