ln (x+2) - ln (3x+1) = 4

We know that ln a - ln b = ln a/b

==> ln (x+2)/(3x+1) = 4

==> (x+2)/(3x+1) = e^4

==> x+2 = (3x+1)*e^4

==> x+2 = 3(e^4)x + 3^4

==> 3(e^4)x - x = e^4 - 2

==> x(3e^4 - 1) = e^4 - 2

==> x = (e^4 - 2)/(3e^4 - 1)

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