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x in (-oo:+oo)
2*x-((3/4)*x^5)-(6*x)-((8/12)*x) = 0
(-3/4)*x^5+2*x-6*x+(-2/3)*x = 0
-3/4*x^5-14/3*x = 0
-x*(3/4*x^4+14/3) = 0
3/4*x^4 = -14/3 // : 3/4
x^4 = -56/9
-x = 0
-1*x = 0 // : -1
x = 0
x = 0
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