exam Maths Puzzle Numerical Ability

I need help solving this equation:

5x^3+20x^2+15x=0

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exam Other Question

Can I please have some help with this question. This is a problem given by my instructor. I have come up with a different answer every time. I am either leaving out a step or performing too many. THANKS!!!!

y/5 - 2/5 = 1/3 - y
Solve the following equation. 3/4x-2=5+2/3x