a-9=3a

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Solution for a-9=3a equation:


Simplifying
a + -9 = 3a

Reorder the terms:
-9 + a = 3a

Solving
-9 + a = 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.
-9 + a + -3a = 3a + -3a

Combine like terms: a + -3a = -2a
-9 + -2a = 3a + -3a

Combine like terms: 3a + -3a = 0
-9 + -2a = 0

Add '9' to each side of the equation.
-9 + 9 + -2a = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -2a = 0 + 9
-2a = 0 + 9

Combine like terms: 0 + 9 = 9
-2a = 9

Divide each side by '-2'.
a = -4.5

Simplifying
a = -4.5

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