-2/5x2-3=-7

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Solution for -2/5x2-3=-7 equation: 


x in (-oo:+oo)

(-2/5)*x^2-3 = -7 // + 7

(-2/5)*x^2-3+7 = 0

-2/5*x^2 = -4 // : -2/5

x^2 = 10

x^2 = 10 // ^ 1/2

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

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

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

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