4y-12=y+y-9

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Solution for 4y-12=y+y-9 equation: 



4y-12=y+y-9

We move all terms to the left:

4y-12-(y+y-9)=0

We add all the numbers together, and all the variables

4y-(2y-9)-12=0

We get rid of parentheses

4y-2y+9-12=0

We add all the numbers together, and all the variables

2y-3=0

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

2y=3

y=3/2

y=1+1/2

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