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x in (-oo:+oo)
(-7/4)*x = ((1/4)*x^7)/8 // - ((1/4)*x^7)/8
(-7/4)*x-(((1/4)*x^7)/8) = 0
(-1/32)*x^7+(-7/4)*x = 0
-1/32*x^7-7/4*x = 0
-1/4*x*(1/8*x^6+7) = 0
1/8*x^6 = -7 // : 1/8
x^6 = -56
-x/4 = 0
-1/4*x = 0 // : -1/4
x = 0
x = 0
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