2a-4a=0

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Solution for 2a-4a=0 equation: 


Simplifying
2a + -4a = 0

Combine like terms: 2a + -4a = -2a
-2a = 0

Solving
-2a = 0

Solving for variable 'a'.

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

Divide each side by '-2'.
a = 0

Simplifying
a = 0

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