7a-9=3+9

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Solution for 7a-9=3+9 equation: 


Simplifying
7a + -9 = 3 + 9

Reorder the terms:
-9 + 7a = 3 + 9

Combine like terms: 3 + 9 = 12
-9 + 7a = 12

Solving
-9 + 7a = 12

Solving for variable 'a'.

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

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

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

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

Divide each side by '7'.
a = 3

Simplifying
a = 3

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