12-39-3=9-5a

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Solution for 12-39-3=9-5a equation:


Simplifying
12 + -39 + -3 = 9 + -5a

Combine like terms: 12 + -39 = -27
-27 + -3 = 9 + -5a

Combine like terms: -27 + -3 = -30
-30 = 9 + -5a

Solving
-30 = 9 + -5a

Solving for variable 'a'.

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

Add '5a' to each side of the equation.
-30 + 5a = 9 + -5a + 5a

Combine like terms: -5a + 5a = 0
-30 + 5a = 9 + 0
-30 + 5a = 9

Add '30' to each side of the equation.
-30 + 30 + 5a = 9 + 30

Combine like terms: -30 + 30 = 0
0 + 5a = 9 + 30
5a = 9 + 30

Combine like terms: 9 + 30 = 39
5a = 39

Divide each side by '5'.
a = 7.8

Simplifying
a = 7.8

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