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x in (-oo:+oo)
((10/7)*x-14)^2 = 20*x // - 20*x
((10/7)*x-14)^2-(20*x) = 0
((10/7)*x-14)^2-20*x = 0
(10/7*x-14)^2-20*x = 0
(10/7*x-14)^2-20*x = 0
100/49*x^2-60*x+196 = 0
100/49*x^2-60*x+196 = 0
4*(25/49*x^2-15*x+49) = 0
25/49*x^2-15*x+49 = 0
DELTA = (-15)^2-(25/49*4*49)
DELTA = 125
DELTA > 0
x = (125^(1/2)+15)/(25/49*2) or x = (15-125^(1/2))/(25/49*2)
x = 49/50*(5*5^(1/2)+15) or x = 49/50*(15-5*5^(1/2))
4*(x-49/50*(15-5*5^(1/2)))*(x-49/50*(5*5^(1/2)+15)) = 0
4*(x-49/50*(15-5*5^(1/2)))*(x-49/50*(5*5^(1/2)+15)) = 0
( 4 )
4 = 0
x belongs to the empty set
( x-49/50*(15-5*5^(1/2)) )
x-49/50*(15-5*5^(1/2)) = 0 // + -49/50*(15-5*5^(1/2))
x = -(-49/50*(15-5*5^(1/2)))
x = 49/50*(15-5*5^(1/2))
( x-49/50*(5*5^(1/2)+15) )
x-49/50*(5*5^(1/2)+15) = 0 // + -49/50*(5*5^(1/2)+15)
x = -(-49/50*(5*5^(1/2)+15))
x = 49/50*(5*5^(1/2)+15)
x in { 49/50*(15-5*5^(1/2)), 49/50*(5*5^(1/2)+15) }
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