book Maths Puzzle Numerical Ability

I need help to solve the following problem: -x-(13+4x)=-3(5-9x)+2

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What is the mathematical average of the number of weeks in a year, seasons in a year, and the number of days in January? Please can I get a detailed explanation.Thanks Please help me with this problem using the pythagrean theorum. One leg of a right triangle is 8 inches long. The hypotenuse is 2 inches longer than the other leg. What is the length of the hypotenuse.