book Maths Puzzle Numerical Ability

5-1/2(x-6)=4 I know that x=8,I`m confused on how to break it down

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book Other Question

Solve the problem: The printed matter on a 12 by 18 centimeter page of a book must cover 40 square centimeters. If all margins are to be the same width, how should the margin be? How do you know the angles of hypotenuse and obtuse?