book Maths Puzzle Numerical Ability

if f(x)=3x+2 find f(6) and f(-2)

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Can you help me with this problem. I have tried to answer this one but I can not get pass the first step. I am not sure if I am evening doing the problem right. (2/3) (12x2 � 18 -2x+y=6
4x-2y=5