18=3a-9

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Solution for 18=3a-9 equation:


Simplifying
18 = 3a + -9

Reorder the terms:
18 = -9 + 3a

Solving
18 = -9 + 3a

Solving for variable 'a'.

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

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

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

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 = -27
-3a = -27

Divide each side by '-3'.
a = 9

Simplifying
a = 9

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