9y+15=y-9

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Solution for 9y+15=y-9 equation:


Simplifying
9y + 15 = y + -9

Reorder the terms:
15 + 9y = y + -9

Reorder the terms:
15 + 9y = -9 + y

Solving
15 + 9y = -9 + y

Solving for variable 'y'.

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

Add '-1y' to each side of the equation.
15 + 9y + -1y = -9 + y + -1y

Combine like terms: 9y + -1y = 8y
15 + 8y = -9 + y + -1y

Combine like terms: y + -1y = 0
15 + 8y = -9 + 0
15 + 8y = -9

Add '-15' to each side of the equation.
15 + -15 + 8y = -9 + -15

Combine like terms: 15 + -15 = 0
0 + 8y = -9 + -15
8y = -9 + -15

Combine like terms: -9 + -15 = -24
8y = -24

Divide each side by '8'.
y = -3

Simplifying
y = -3

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