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x in (-oo:+oo)
0.2 = (x^2)/35-x // - (x^2)/35-x
x-((x^2)/35)+0.2 = 0
x-1/35*x^2+0.2 = 0
DELTA = 1^2-(-1/35*0.2*4)
DELTA = 1.022857144
DELTA > 0
x = (1.022857144^(1/2)-1)/(-1/35*2) or x = (-1.022857144^(1/2)-1)/(-1/35*2)
x = -35/2*(1.022857144^(1/2)-1) or x = 35/2*(1.022857144^(1/2)+1)
x in { -35/2*(1.022857144^(1/2)-1), 35/2*(1.022857144^(1/2)+1) }
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