9=-5y-21

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Solution for 9=-5y-21 equation:


Simplifying
9 = -5y + -21

Reorder the terms:
9 = -21 + -5y

Solving
9 = -21 + -5y

Solving for variable 'y'.

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

Add '5y' to each side of the equation.
9 + 5y = -21 + -5y + 5y

Combine like terms: -5y + 5y = 0
9 + 5y = -21 + 0
9 + 5y = -21

Add '-9' to each side of the equation.
9 + -9 + 5y = -21 + -9

Combine like terms: 9 + -9 = 0
0 + 5y = -21 + -9
5y = -21 + -9

Combine like terms: -21 + -9 = -30
5y = -30

Divide each side by '5'.
y = -6

Simplifying
y = -6

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