-9=a+21

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Solution for -9=a+21 equation:


Simplifying
-9 = a + 21

Reorder the terms:
-9 = 21 + a

Solving
-9 = 21 + a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
-9 + -1a = 21 + a + -1a

Combine like terms: a + -1a = 0
-9 + -1a = 21 + 0
-9 + -1a = 21

Add '9' to each side of the equation.
-9 + 9 + -1a = 21 + 9

Combine like terms: -9 + 9 = 0
0 + -1a = 21 + 9
-1a = 21 + 9

Combine like terms: 21 + 9 = 30
-1a = 30

Divide each side by '-1'.
a = -30

Simplifying
a = -30

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