4a-6a=9

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Solution for 4a-6a=9 equation: 


Simplifying
4a + -6a = 9

Combine like terms: 4a + -6a = -2a
-2a = 9

Solving
-2a = 9

Solving for variable 'a'.

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

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

Simplifying
a = -4.5

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