140=0.07x^2/2

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Solution for 140=0.07x^2/2 equation: 


x in (-oo:+oo)

140 = (0.07*x^2)/2 // - (0.07*x^2)/2

140-((0.07*x^2)/2) = 0

140-0.035*x^2 = 0

-0.035*x^2 = -140 // : -0.035

x^2 = 4000

x^2 = 4000 // ^ 1/2

abs(x) = 20*10^(1/2)

x = 20*10^(1/2) or x = -(20*10^(1/2))

x in { 20*10^(1/2), -(20*10^(1/2)) }

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