exam Maths Puzzle Numerical Ability

hi there my teacher is teaching my class about Linear Plot and I'm kinda confused can you help.

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exam Other Question

simplify:

[(3x^3)/(x^3+27)] - [ (x)/(x+3) ] + [(2x^2)/(x^2-3x+9) ]
simplify

6.7x(3x-2y)+1.2(x^2-y^2)