12y+3y=30

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Solution for 12y+3y=30 equation: 


Simplifying
12y + 3y = 30

Combine like terms: 12y + 3y = 15y
15y = 30

Solving
15y = 30

Solving for variable 'y'.

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

Divide each side by '15'.
y = 2

Simplifying
y = 2

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