book Maths Puzzle Numerical Ability

is any one out their that can help me with this problem a.s.a.p i would really apprecate it. translate the difference between twelve times a number and the number into a mathematic

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During the past year a ceratain dentist had 1/4 more patients than he did during the previous year. However, during the past year 1/5 of the patients did not pay their dentist's bi x^6*X^7