-3y-12=-21

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Solution for -3y-12=-21 equation: 


Simplifying
-3y + -12 = -21

Reorder the terms:
-12 + -3y = -21

Solving
-12 + -3y = -21

Solving for variable 'y'.

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

Add '12' to each side of the equation.
-12 + 12 + -3y = -21 + 12

Combine like terms: -12 + 12 = 0
0 + -3y = -21 + 12
-3y = -21 + 12

Combine like terms: -21 + 12 = -9
-3y = -9

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

Simplifying
y = 3

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