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f in (-oo:+oo)
f^7 = (3/4)^7+5 // - (3/4)^7+5
f^7-(3/4)^7-5 = 0
1*f^7 = 84107/16384 // : 1
f^7 = 84107/16384
f^7 = 84107/16384 // ^ 1/7
f = (84107/16384)^(1/7)
f = (84107/16384)^(1/7)
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