-6a+21=-9

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Solution for -6a+21=-9 equation: 


Simplifying
-6a + 21 = -9

Reorder the terms:
21 + -6a = -9

Solving
21 + -6a = -9

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 + -6a = -9 + -21

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

Combine like terms: -9 + -21 = -30
-6a = -30

Divide each side by '-6'.
a = 5

Simplifying
a = 5

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