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x in (-oo:+oo)
m = ((4/5)*x^7)/9 // - ((4/5)*x^7)/9
m-(((4/5)*x^7)/9) = 0
m+(-4/45)*x^7 = 0
-4/45*x^7 = -m // : -4/45
x^7 = 45/4*m
x^7 = 45/4*m // ^ 1/7
x = (45/4)^(1/7)*m^(1/7)
x = (45/4)^(1/7)*m^(1/7)
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