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500^(1/2)*x+402^(1/2) = 0
10*5^(1/2)*x+402^(1/2) = 0 // - 402^(1/2)
10*5^(1/2)*x = -402^(1/2) // : 10*5^(1/2)
x = (-402^(1/2))/(10*5^(1/2))
x = (-402^(1/2))/(10*5^(1/2))
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