ln(x-7/x^2+12x+36)-ln(x^2-49/x+6)
x^2+12x+36 = (x+6)(x+6) so ln of (x-7)(x+6) ===================== (x+6)(x+6)(x+7)(x-7) ln of 1 ===================== (x+6)(x+1) = ln 1 - ln(x^2 +7x + 6) but ln 1 = 0 so - ln (x^2 + 7 x + 6)
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