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Express x^³ = e^( 6x - 1) in the form of 
ln x = ax + b and find a and b
x^3 = e^(6x-1)
ln(x^3) = 6x-1  |Take ln of both sides of the EQ
3*ln(x) = 6x-1
  ln(x) = 2x-1/3   ⇒  a = 2  and b = -1/3
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