y+2y+4y=21

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Solution for y+2y+4y=21 equation: 


Simplifying
y + 2y + 4y = 21

Combine like terms: y + 2y = 3y
3y + 4y = 21

Combine like terms: 3y + 4y = 7y
7y = 21

Solving
7y = 21

Solving for variable 'y'.

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

Divide each side by '7'.
y = 3

Simplifying
y = 3

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