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y in (-oo:+oo)
(1/5)*y^2-2 = (-3/10)*y // - (-3/10)*y
(1/5)*y^2-((-3/10)*y)-2 = 0
(1/5)*y^2+(3/10)*y-2 = 0
1/5*y^2+3/10*y-2 = 0
DELTA = (3/10)^2-(-2*1/5*4)
DELTA = 169/100
DELTA > 0
y = ((169/100)^(1/2)-3/10)/(1/5*2) or y = (-(169/100)^(1/2)-3/10)/(1/5*2)
y = 5/2 or y = -4
y in { -4, 5/2 }
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