-3y^2-9=-27

Solution for -3y^2-9=-27 equation:

Simplifying
-3y2 + -9 = -27

Reorder the terms:
-9 + -3y2 = -27

Solving
-9 + -3y2 = -27

Solving for variable 'y'.

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

Add '9' to each side of the equation.
-9 + 9 + -3y2 = -27 + 9

Combine like terms: -9 + 9 = 0
0 + -3y2 = -27 + 9
-3y2 = -27 + 9

Combine like terms: -27 + 9 = -18
-3y2 = -18

Divide each side by '-3'.
y2 = 6

Simplifying
y2 = 6

Take the square root of each side:
y = {-2.449489743, 2.449489743}