exam Maths Puzzle Numerical Ability

x+4/3x+2 - x+4/3x+2 =

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The amount of a radioactive tracer remaining after t days is given by A=Aoe^-0.058t, where Ao is the starting amount at the beginning of the time period. How many days will it take for one half of the original amount to decay? f(x)=log7(6x exponent 3 + 11x exponent 2- x+1)