21-9y+6+3y=

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Solution for 21-9y+6+3y= equation:


21-9y+6+3y=0

We simplify the equation to the form, which is simple to understand 
21-9y+6+3y=0

We move all terms containing y to the left and all other terms to the right. 
-9y+3y=0-21-6

We simplify left and right side of the equation. 
-6y=-27

We divide both sides of the equation by -6 to get y. 
y=4.5

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