21-3a=-12

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Solution for 21-3a=-12 equation: 


Simplifying
21 + -3a = -12

Solving
21 + -3a = -12

Solving for variable 'a'.

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

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

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

Combine like terms: -12 + -21 = -33
-3a = -33

Divide each side by '-3'.
a = 11

Simplifying
a = 11

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