exam Maths Puzzle Numerical Ability

If fifteen less than two times a number is divided by six more than the number, the result is four less than 9 times the reciprocal of that number. Find the number

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exam Other Question
What is the domain and range of the following relation: r = (x + 2)/(x - 1)? hi could you please help me solve this problem?
f(x)=√4xy^4 √8x^3y^2/√2x^-4y^5
thank you