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X in (-oo:+oo)
X*((((18*X^3)/2)*X^4)/(-7))-((3/1)/4) = 0
X*((((18*X^3)/2)*X^4)/(-7))-3/4 = 0
-9/7*X^8 = 3/4 // : -9/7
X^8 = -7/12
X belongs to the empty set
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