exam Maths Puzzle Numerical Ability

PLease help me add or subtract and simplify.(If the denominator has 3 or more factors other than monomials it needs to be left factored.)

a-8b over a+b + a+13b over a+b

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exam Other Question

Solve the system of equations y=2x-10 and x-y=7 The volume of a quantity of an ideal gas was held constant. The inital pressure and temperature were 8000 torr and 1500 kelvins. What was the final pressure if the temperature was raised to 3270 kelvins.