3a=a-18

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Solution for 3a=a-18 equation: 


Simplifying
3a = a + -18

Reorder the terms:
3a = -18 + a

Solving
3a = -18 + a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
3a + -1a = -18 + a + -1a

Combine like terms: 3a + -1a = 2a
2a = -18 + a + -1a

Combine like terms: a + -1a = 0
2a = -18 + 0
2a = -18

Divide each side by '2'.
a = -9

Simplifying
a = -9

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