exam Maths Puzzle Numerical Ability

cannot figure this out..: let f(x)=x^3-1 and g(x)=x^2+x+1. find (f/g)(x).

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Please help me.

2x - (4x + 3) < 6x + 3(x + 4)
Solve the system by addition.
x + y = 4
x – y = 10