exam Maths Puzzle Numerical Ability

27^3x=9^4x-2

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How do you do this?
Use the expression r+0.12m to calculate the cost of renting a car. The basic rate is r. The miles driven is m.Determine the cost for the following.

The basic rate is $15.95.The car driven is 150 miles. I need some help with integrals. Here is one a do not get: intergral of (e^x)/(1+e^x)^2 with the min 0 and max 2