y=21-2y

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Solution for y=21-2y equation: 


Simplifying
y = 21 + -2y

Solving
y = 21 + -2y

Solving for variable 'y'.

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

Add '2y' to each side of the equation.
y + 2y = 21 + -2y + 2y

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

Combine like terms: -2y + 2y = 0
3y = 21 + 0
3y = 21

Divide each side by '3'.
y = 7

Simplifying
y = 7

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