y+3y=15

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Solution for y+3y=15 equation: 


Simplifying
y + 3y = 15

Combine like terms: y + 3y = 4y
4y = 15

Solving
4y = 15

Solving for variable 'y'.

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

Divide each side by '4'.
y = 3.75

Simplifying
y = 3.75

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