3*-9-9y=21

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Solution for 3*-9-9y=21 equation: 


Simplifying
3 * -9 + -9y = 21

Multiply 3 * -9
-27 + -9y = 21

Solving
-27 + -9y = 21

Solving for variable 'y'.

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

Add '27' to each side of the equation.
-27 + 27 + -9y = 21 + 27

Combine like terms: -27 + 27 = 0
0 + -9y = 21 + 27
-9y = 21 + 27

Combine like terms: 21 + 27 = 48
-9y = 48

Divide each side by '-9'.
y = -5.333333333

Simplifying
y = -5.333333333

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