15=5x^2/7

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Solution for 15=5x^2/7 equation: 


x in (-oo:+oo)

15 = (5*x^2)/7 // - (5*x^2)/7

15-((5*x^2)/7) = 0

(-5/7)*x^2+15 = 0

-5/7*x^2 = -15 // : -5/7

x^2 = 21

x^2 = 21 // ^ 1/2

abs(x) = 21^(1/2)

x = 21^(1/2) or x = -21^(1/2)

x in { 21^(1/2), -21^(1/2) }

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