exam Maths Puzzle Numerical Ability

Find f (-1/3). f(x)=18x2-12x-3

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exam Other Question

Solve. 3x - 7 = 2x + 8
my answer is x = 15
Is this correct? I am stuck on correct answer for:

If x is directly proportional to y and x = 3 when y = 8, what is the value of x when y = 2

I am not using a specific book. I am just practicing...