exam Maths Puzzle Numerical Ability

graph equation
y=1/3x

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exam Other Question

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!
Help me please, I have tried to understand how to do this one..

Write the expression in simplest form.

ab - 3a + 5b - 15/15 + 3a^2 - 5b - a^2b

Thank you