2y+4y=21-y

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


Simplifying
2y + 4y = 21 + -1y

Combine like terms: 2y + 4y = 6y
6y = 21 + -1y

Solving
6y = 21 + -1y

Solving for variable 'y'.

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

Add 'y' to each side of the equation.
6y + y = 21 + -1y + y

Combine like terms: 6y + y = 7y
7y = 21 + -1y + y

Combine like terms: -1y + y = 0
7y = 21 + 0
7y = 21

Divide each side by '7'.
y = 3

Simplifying
y = 3

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