5x^2=5/7x

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


x in (-oo:+oo)

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

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

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

5*x^2-5/7*x = 0

DELTA = (-5/7)^2-(0*4*5)

DELTA = 25/49

DELTA > 0

x = ((25/49)^(1/2)+5/7)/(2*5) or x = (5/7-(25/49)^(1/2))/(2*5)

x = 1/7 or x = 0

x in { 0, 1/7 }

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