4y-6+5y=21

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Solution for 4y-6+5y=21 equation: 



4y-6+5y=21

We move all terms to the left:

4y-6+5y-(21)=0

We add all the numbers together, and all the variables

9y-27=0

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

9y=27

y=27/9

y=3

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