-21=-3(y+9)

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Solution for -21=-3(y+9) equation:


Simplifying
-21 = -3(y + 9)

Reorder the terms:
-21 = -3(9 + y)
-21 = (9 * -3 + y * -3)
-21 = (-27 + -3y)

Solving
-21 = -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.
-21 + 3y = -27 + -3y + 3y

Combine like terms: -3y + 3y = 0
-21 + 3y = -27 + 0
-21 + 3y = -27

Add '21' to each side of the equation.
-21 + 21 + 3y = -27 + 21

Combine like terms: -21 + 21 = 0
0 + 3y = -27 + 21
3y = -27 + 21

Combine like terms: -27 + 21 = -6
3y = -6

Divide each side by '3'.
y = -2

Simplifying
y = -2

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