9-a=-3a

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Solution for 9-a=-3a equation:


Simplifying
9 + -1a = -3a

Solving
9 + -1a = -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 + -1a + 3a = -3a + 3a

Combine like terms: -1a + 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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