book Maths Puzzle Numerical Ability

7. Uniform Motion Example.

Two mountain bikers started from the ranger station in Rocky Mountain National Park
traveling in the same direction on Trail Ridge Road. The first bi

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Hi,
Please solve the equation:

{{{3^x - 3(1 - 1/3^x) = 1}}}


I have tried multiplying out the bracket but still can't find the solution.
Please help. 1=3-2x