a-2a=3

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Solution for a-2a=3 equation: 


Simplifying
a + -2a = 3

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

Solving
-1a = 3

Solving for variable 'a'.

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

Divide each side by '-1'.
a = -3

Simplifying
a = -3

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