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(1/5)*x-((1/12)*x^2)+2*x+12*x-5 = 0
(-1/12)*x^2+(1/5)*x+2*x+12*x-5 = 0
71/5*x-1/12*x^2-5 = 0
DELTA = (71/5)^2-(-5*(-1/12)*4)
DELTA = 14998/75
DELTA > 0
x = ((14998/75)^(1/2)-71/5)/(-1/12*2) or x = (-(14998/75)^(1/2)-71/5)/(-1/12*2)
x = -6*((14998/75)^(1/2)-71/5) or x = 6*((14998/75)^(1/2)+71/5)
x in { -6*((14998/75)^(1/2)-71/5), 6*((14998/75)^(1/2)+71/5) }
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