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x in (-oo:+oo)
5^7*x-9 = 1/125 // - 1/125
5^7*x-(1/125)-9 = 0
5^7*x-1/125-9 = 0
78125*x-1126/125 = 0 // + 1126/125
78125*x = 1126/125 // : 78125
x = 1126/125/78125
x = 1126/9765625
x = 1126/9765625
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