a*2=-1

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Solution for a*2=-1 equation: 


Simplifying
a * 2 = -1

Reorder the terms for easier multiplication:
2a = -1

Solving
2a = -1

Solving for variable 'a'.

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

Divide each side by '2'.
a = -0.5

Simplifying
a = -0.5

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