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x in (-oo:+oo)
y = ln(8)*x-(7*ln(7))+1/8 // - ln(8)*x-(7*ln(7))+1/8
y-(ln(8)*x)+7*ln(7)-(1/8) = 0
y-(ln(8)*x)+7*ln(7)-1/8 = 0
y-ln(8)*x+7*ln(7)-1/8 = 0 // - y+7*ln(7)-1/8
-ln(8)*x = -(y+7*ln(7)-1/8) // : -ln(8)
x = (-(y+7*ln(7)-1/8))/(-ln(8))
x = -((ln(8))^-1*(1/8-y-(7*ln(7))))
x = -((ln(8))^-1*(1/8-y-(7*ln(7))))
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