21+2y-5=9y-12-3y

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Solution for 21+2y-5=9y-12-3y equation: 



21+2y-5=9y-12-3y

We move all terms to the left:

21+2y-5-(9y-12-3y)=0

We add all the numbers together, and all the variables

2y-(6y-12)+21-5=0

We add all the numbers together, and all the variables

2y-(6y-12)+16=0

We get rid of parentheses

2y-6y+12+16=0

We add all the numbers together, and all the variables

-4y+28=0

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

-4y=-28

y=-28/-4

y=+7

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