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x in (-oo:+oo)
(x+3/7)^2 = 11/49 // - 11/49
(x+3/7)^2-(11/49) = 0
(x+3/7)^2-11/49 = 0
(49*(x+3/7)^2)/49-11/49 = 0
49*(x+3/7)^2-11 = 0
49*x^2+42*x-2 = 0
49*x^2+42*x-2 = 0
49*x^2+42*x-2 = 0
DELTA = 42^2-(-2*4*49)
DELTA = 2156
DELTA > 0
x = (2156^(1/2)-42)/(2*49) or x = (-2156^(1/2)-42)/(2*49)
x = (14*11^(1/2)-42)/98 or x = (-14*11^(1/2)-42)/98
(x-((-14*11^(1/2)-42)/98))*(x-((14*11^(1/2)-42)/98)) = 0
((x-((-14*11^(1/2)-42)/98))*(x-((14*11^(1/2)-42)/98)))/49 = 0
((x-((-14*11^(1/2)-42)/98))*(x-((14*11^(1/2)-42)/98)))/49 = 0 // * 49
(x-((-14*11^(1/2)-42)/98))*(x-((14*11^(1/2)-42)/98)) = 0
( x-((-14*11^(1/2)-42)/98) )
x-((-14*11^(1/2)-42)/98) = 0 // + (-14*11^(1/2)-42)/98
x = (-14*11^(1/2)-42)/98
( x-((14*11^(1/2)-42)/98) )
x-((14*11^(1/2)-42)/98) = 0 // + (14*11^(1/2)-42)/98
x = (14*11^(1/2)-42)/98
x in { (-14*11^(1/2)-42)/98, (14*11^(1/2)-42)/98 }
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