-0.4a=-2

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Solution for -0.4a=-2 equation: 


Simplifying
-0.4a = -2

Solving
-0.4a = -2

Solving for variable 'a'.

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

Divide each side by '-0.4'.
a = 5

Simplifying
a = 5

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