3y+9y=21

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Solution for 3y+9y=21 equation: 


Simplifying
3y + 9y = 21

Combine like terms: 3y + 9y = 12y
12y = 21

Solving
12y = 21

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Divide each side by '12'.
y = 1.75

Simplifying
y = 1.75

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