-2y=-y-9

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Solution for -2y=-y-9 equation: 


Simplifying
-2y = -1y + -9

Reorder the terms:
-2y = -9 + -1y

Solving
-2y = -9 + -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.
-2y + y = -9 + -1y + y

Combine like terms: -2y + y = -1y
-1y = -9 + -1y + y

Combine like terms: -1y + y = 0
-1y = -9 + 0
-1y = -9

Divide each side by '-1'.
y = 9

Simplifying
y = 9

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