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x in (-oo:+oo)
(x^2)/35+(12*x)/35 = 0
1/35*x^2+12/35*x = 0
DELTA = (12/35)^2-(0*1/35*4)
DELTA = 144/1225
DELTA > 0
x = ((144/1225)^(1/2)-12/35)/(1/35*2) or x = (-(144/1225)^(1/2)-12/35)/(1/35*2)
x = 0 or x = -12
x in { -12, 0 }
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