exam Maths Puzzle Numerical Ability

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given f(x)=15x^3-4x^2+3x-8, find all possible rational zeros

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exam Other Question

I need to solvethe equation 6/5 +3/2x = 7/15

I have tried multiplying both sides by 30x but end up with x=-45/22 or-2 1/22 ? 7 4 1 | ? 8 5 2
? 7 4 1
? 8 5 2
What numbers should replace question marks ??