-9y-15=3(y+9)

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Solution for -9y-15=3(y+9) equation:


Simplifying
-9y + -15 = 3(y + 9)

Reorder the terms:
-15 + -9y = 3(y + 9)

Reorder the terms:
-15 + -9y = 3(9 + y)
-15 + -9y = (9 * 3 + y * 3)
-15 + -9y = (27 + 3y)

Solving
-15 + -9y = 27 + 3y

Solving for variable 'y'.

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

Add '-3y' to each side of the equation.
-15 + -9y + -3y = 27 + 3y + -3y

Combine like terms: -9y + -3y = -12y
-15 + -12y = 27 + 3y + -3y

Combine like terms: 3y + -3y = 0
-15 + -12y = 27 + 0
-15 + -12y = 27

Add '15' to each side of the equation.
-15 + 15 + -12y = 27 + 15

Combine like terms: -15 + 15 = 0
0 + -12y = 27 + 15
-12y = 27 + 15

Combine like terms: 27 + 15 = 42
-12y = 42

Divide each side by '-12'.
y = -3.5

Simplifying
y = -3.5

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