9y-21=-77

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Solution for 9y-21=-77 equation: 


Simplifying
9y + -21 = -77

Reorder the terms:
-21 + 9y = -77

Solving
-21 + 9y = -77

Solving for variable 'y'.

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

Add '21' to each side of the equation.
-21 + 21 + 9y = -77 + 21

Combine like terms: -21 + 21 = 0
0 + 9y = -77 + 21
9y = -77 + 21

Combine like terms: -77 + 21 = -56
9y = -56

Divide each side by '9'.
y = -6.222222222

Simplifying
y = -6.222222222

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