exam Maths Puzzle Numerical Ability

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

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exam Other Question

A 40% antifreeze solution and a 70% antifreeze solution is mixed to make 12 gallons of 50% antifrezze solution. How many gallons of each antifreeze solution should be used. I need help solving this equation:

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