a-2a=-5

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Solution for a-2a=-5 equation: 


Simplifying
a + -2a = -5

Combine like terms: a + -2a = -1a
-1a = -5

Solving
-1a = -5

Solving for variable 'a'.

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

Divide each side by '-1'.
a = 5

Simplifying
a = 5

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