3x^2-6=5/7x^2

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Solution for 3x^2-6=5/7x^2 equation: 


x in (-oo:+oo)

3*x^2-6 = (5/7)*x^2 // - (5/7)*x^2

3*x^2-((5/7)*x^2)-6 = 0

3*x^2+(-5/7)*x^2-6 = 0

16/7*x^2 = 6 // : 16/7

x^2 = 21/8

x^2 = 21/8 // ^ 1/2

abs(x) = (21/8)^(1/2)

x = (21/8)^(1/2) or x = -(21/8)^(1/2)

x in { (21/8)^(1/2), -(21/8)^(1/2) }

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