3*-2-9y=21

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Solution for 3*-2-9y=21 equation: 


Simplifying
3 * -2 + -9y = 21

Multiply 3 * -2
-6 + -9y = 21

Solving
-6 + -9y = 21

Solving for variable 'y'.

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

Add '6' to each side of the equation.
-6 + 6 + -9y = 21 + 6

Combine like terms: -6 + 6 = 0
0 + -9y = 21 + 6
-9y = 21 + 6

Combine like terms: 21 + 6 = 27
-9y = 27

Divide each side by '-9'.
y = -3

Simplifying
y = -3

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