exam Maths Puzzle Numerical Ability

Can you help me solve these problems

Perform the indicated operation
1.)3x+6/4x^2 - 2x-1/x^3 -5/8x

2.) 5/M-2+3/M+3

Thanks

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exam Other Question

x to the 2nd power -5x+4 A company payroll is prepared by 2 computers in 13 and 1/3min. W orking alone, the faster of the 2 computers can prepare the payroll in 20 minutes. How much time does the slower computer alone require to prepare the payroll?