7a-12=9

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Solution for 7a-12=9 equation: 


Simplifying
7a + -12 = 9

Reorder the terms:
-12 + 7a = 9

Solving
-12 + 7a = 9

Solving for variable 'a'.

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

Add '12' to each side of the equation.
-12 + 12 + 7a = 9 + 12

Combine like terms: -12 + 12 = 0
0 + 7a = 9 + 12
7a = 9 + 12

Combine like terms: 9 + 12 = 21
7a = 21

Divide each side by '7'.
a = 3

Simplifying
a = 3

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