-9-9y=21

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Solution for -9-9y=21 equation: 


Simplifying
-9 + -9y = 21

Solving
-9 + -9y = 21

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 + -9y = 21 + 9

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

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

Divide each side by '-9'.
y = -3.333333333

Simplifying
y = -3.333333333

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