book Maths Puzzle Numerical Ability

i need help with absolute numbers.
[3x+2]+4=9

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The equation C=5(F-32)/9 gives the relation between Fahrenheit and Celsius temperatures. Find the temperature at which the reading is the same on both thermometers. 58) If the total bill at a restaurant including a 15% top, is 65.32 , what was the cost of the meal alone?