12a+13-9a=31

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Solution for 12a+13-9a=31 equation:


Simplifying
12a + 13 + -9a = 31

Reorder the terms:
13 + 12a + -9a = 31

Combine like terms: 12a + -9a = 3a
13 + 3a = 31

Solving
13 + 3a = 31

Solving for variable 'a'.

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

Add '-13' to each side of the equation.
13 + -13 + 3a = 31 + -13

Combine like terms: 13 + -13 = 0
0 + 3a = 31 + -13
3a = 31 + -13

Combine like terms: 31 + -13 = 18
3a = 18

Divide each side by '3'.
a = 6

Simplifying
a = 6

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