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x in (-oo:+oo)
(36*x^2)/3+(84*x^1)/3+49 = 0
(36*x^2)/3+(84*x)/3+49 = 0
12*x^2+28*x+49 = 0
DELTA = 28^2-(4*12*49)
DELTA = -1568
DELTA < 0
x belongs to the empty set
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