exam Maths Puzzle Numerical Ability

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

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exam Other Question

Solve the inequality [x^2 - 4X]<5. Its mod x^2-4x less than 5.
Can some help me in solving this? Help Please

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

thanks for your help