book Maths Puzzle Numerical Ability

((2x+3)/x)+4/(x-1)=0

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book Other Question

Solve the following triangle for x: The three angles of the traingle have measures of x, 2x and 3x 7. The sum of two numbers is 17 and the sum of their square is 145. Find the larger number.
a. 10 b. 11 c. 8 d. 9 e. none
The answer is D, but how? Please help me prepare for my