(1/7x)^2=(3/7x)

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Solution for (1/7x)^2=(3/7x) equation: 


x in (-oo:+oo)

((1/7)*x)^2 = (3/7)*x // - (3/7)*x

((1/7)*x)^2-((3/7)*x) = 0

((1/7)*x)^2+(-3/7)*x = 0

1/49*x^2-3/7*x = 0

DELTA = (-3/7)^2-(0*1/49*4)

DELTA = 9/49

DELTA > 0

x = ((9/49)^(1/2)+3/7)/(1/49*2) or x = (3/7-(9/49)^(1/2))/(1/49*2)

x = 21 or x = 0

x in { 0, 21 }

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