-y=2y+-21

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


Simplifying
-1y = 2y + -21

Reorder the terms:
-1y = -21 + 2y

Solving
-1y = -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.
-1y + -2y = -21 + 2y + -2y

Combine like terms: -1y + -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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