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Simplifying
a2 + 2a2 = c2
Combine like terms: a2 + 2a2 = 3a2
3a2 = c2
Solving
3a2 = c2
Solving for variable 'a'.
Move all terms containing a to the left, all other terms to the right.
Divide each side by '3'.
a2 = 0.3333333333c2
Simplifying
a2 = 0.3333333333c2
Take the square root of each side:
a = {-0.577350269c, 0.577350269c}
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