exam Maths Puzzle Numerical Ability

Need help solving this rational expresion

x+4/x^2-7x+6 + 4x-7/x^2-6x+5

reads x+4 over x^2-7x+6 minus 4x+7 over x^2-6x+5

Thanks!!

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exam Other Question

if paddles on a windmill are 80 ft. long; do 4 reps per min.-how fast do the outside of the paddles travel per hour? Write a flowchart proof for the conjecture: The diagonals of a rectangle are congruent.
Given: Rectangle ABCD with diagonals AC and BD
Show: AC is congruent to BD

i tried i j