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x in (-oo:+oo)
7*(1/4)^6-(5*x) = 3 // - 3
7*(1/4)^6-(5*x)-3 = 0
7*(1/4)^6-5*x-3 = 0
-5*x-12281/4096 = 0 // + 12281/4096
-5*x = 12281/4096 // : -5
x = 12281/4096/(-5)
x = -12281/20480
x = -12281/20480
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