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x in (-oo:+oo)
(3.09/5)*x = 1 // - 1
(3.09/5)*x-1 = 0
0.618*x-1 = 0 // + 1
0.618*x = 1 // : 0.618
x = 1/0.618
x = 1.61812298
x = 1.61812298
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