exam Maths Puzzle Numerical Ability

x-[3x-2(9-x)-x]-1 < x-(5-x)
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exam Other Question

(sin(x+pi))/(cos(x-pi)) i need to know the laest common multiple of the pair of polynomials and have them factored. i am stuck on these two:
1) (1)/6x2-11x+3 (+) (1)/8x2-18

2) 4r/r-2 (+) 4r/r+2

thank you for your help!