book Maths Puzzle Numerical Ability

Combine like terms
3x^3+5xy+x^3-xy

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I have tried everything i know to solve this problem but i cannot answer the problem correctly please help :
8f-3(f+6)=2f-16 solve inequalities.
A. x^3-x^2-4x+4<0
B.3x^2-7x+2 <0
x+1