-28=9-a

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Solution for -28=9-a equation:


Simplifying
-28 = 9 + -1a

Solving
-28 = 9 + -1a

Solving for variable 'a'.

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

Add 'a' to each side of the equation.
-28 + a = 9 + -1a + a

Combine like terms: -1a + a = 0
-28 + a = 9 + 0
-28 + a = 9

Add '28' to each side of the equation.
-28 + 28 + a = 9 + 28

Combine like terms: -28 + 28 = 0
0 + a = 9 + 28
a = 9 + 28

Combine like terms: 9 + 28 = 37
a = 37

Simplifying
a = 37

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