-21-3y=6

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Solution for -21-3y=6 equation: 


Simplifying
-21 + -3y = 6

Solving
-21 + -3y = 6

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 + -3y = 6 + 21

Combine like terms: -21 + 21 = 0
0 + -3y = 6 + 21
-3y = 6 + 21

Combine like terms: 6 + 21 = 27
-3y = 27

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

Simplifying
y = -9

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