18-3a=9

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Solution for 18-3a=9 equation: 


Simplifying
18 + -3a = 9

Solving
18 + -3a = 9

Solving for variable 'a'.

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

Add '-18' to each side of the equation.
18 + -18 + -3a = 9 + -18

Combine like terms: 18 + -18 = 0
0 + -3a = 9 + -18
-3a = 9 + -18

Combine like terms: 9 + -18 = -9
-3a = -9

Divide each side by '-3'.
a = 3

Simplifying
a = 3

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