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x <= 0
x <= 0
x in (0:+oo)
(6/15)*ln(x)-(7*ln(y)) = ln(a) // - ln(a)
(6/15)*ln(x)-(7*ln(y))-ln(a) = 0
(6/15)*ln(x)-7*ln(y)-ln(a) = 0
t_1 = ln(x)
t_2 = ln(y)
t_3 = -ln(a)
(6/15)*t_1-7*ln(y)-ln(a) = 0
(2*t_1)/5-7*t_2+t_3 = 0
(2*t_1)/5+(-7*5*t_2)/5+(5*t_3)/5 = 0
2*t_1-7*5*t_2+5*t_3 = 0
2*t_1-35*t_2+5*t_3 = 0
(2*t_1-35*t_2+5*t_3)/5 = 0
(2*t_1-35*t_2+5*t_3)/5 = 0 // * 5
2*t_1-35*t_2+5*t_3 = 0
2*t_1-35*t_2+5*t_3 = 0 // - 5*t_3-35*t_2
2*t_1 = -(5*t_3-35*t_2) // : 2
t_1 = (-(5*t_3-35*t_2))/2
t_1 = (-(5*(-ln(a))-35*ln(y)))/2
ln(x) = (-(5*(-ln(a))-35*ln(y)))/2
ln(x) = ln(e^((-(5*(-ln(a))-35*ln(y)))/2))
x = e^((-(5*(-ln(a))-35*ln(y)))/2)
x = e^((-(-35*ln(y)-5*ln(a)))/2)
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