21-3y=-9

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Solution for 21-3y=-9 equation: 


Simplifying
21 + -3y = -9

Solving
21 + -3y = -9

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 = -9 + -21

Combine like terms: 21 + -21 = 0
0 + -3y = -9 + -21
-3y = -9 + -21

Combine like terms: -9 + -21 = -30
-3y = -30

Divide each side by '-3'.
y = 10

Simplifying
y = 10

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