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x in (-oo:+oo)
(3/4)*x^2+7*x+16 = 0
3/4*x^2+7*x+16 = 0
DELTA = 7^2-(3/4*4*16)
DELTA = 1
DELTA > 0
x = (1^(1/2)-7)/(3/4*2) or x = (-1^(1/2)-7)/(3/4*2)
x = -4 or x = -16/3
x in { -16/3, -4 }
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