2y+9=-y-9

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


Simplifying
2y + 9 = -1y + -9

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

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

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

Combine like terms: 2y + y = 3y
9 + 3y = -9 + -1y + y

Combine like terms: -1y + y = 0
9 + 3y = -9 + 0
9 + 3y = -9

Add '-9' to each side of the equation.
9 + -9 + 3y = -9 + -9

Combine like terms: 9 + -9 = 0
0 + 3y = -9 + -9
3y = -9 + -9

Combine like terms: -9 + -9 = -18
3y = -18

Divide each side by '3'.
y = -6

Simplifying
y = -6

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