3a-4a=9-4a

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Solution for 3a-4a=9-4a equation: 


Simplifying
3a + -4a = 9 + -4a

Combine like terms: 3a + -4a = -1a
-1a = 9 + -4a

Solving
-1a = 9 + -4a

Solving for variable 'a'.

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

Add '4a' to each side of the equation.
-1a + 4a = 9 + -4a + 4a

Combine like terms: -1a + 4a = 3a
3a = 9 + -4a + 4a

Combine like terms: -4a + 4a = 0
3a = 9 + 0
3a = 9

Divide each side by '3'.
a = 3

Simplifying
a = 3

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