9y-15=-3(y+7)

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Solution for 9y-15=-3(y+7) equation:


Simplifying
9y + -15 = -3(y + 7)

Reorder the terms:
-15 + 9y = -3(y + 7)

Reorder the terms:
-15 + 9y = -3(7 + y)
-15 + 9y = (7 * -3 + y * -3)
-15 + 9y = (-21 + -3y)

Solving
-15 + 9y = -21 + -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 = -21 + -3y + 3y

Combine like terms: 9y + 3y = 12y
-15 + 12y = -21 + -3y + 3y

Combine like terms: -3y + 3y = 0
-15 + 12y = -21 + 0
-15 + 12y = -21

Add '15' to each side of the equation.
-15 + 15 + 12y = -21 + 15

Combine like terms: -15 + 15 = 0
0 + 12y = -21 + 15
12y = -21 + 15

Combine like terms: -21 + 15 = -6
12y = -6

Divide each side by '12'.
y = -0.5

Simplifying
y = -0.5

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