exam Maths Puzzle Numerical Ability

2/3t=-1/5

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I hope I am in the right section but I am completly loss with this.

If f(x)=x(x-1)(x-4)^2, use interval notation to give all values of x where f(x)>0.

a. (-infinity,0)U(4,inf how do u solve this? -7=2/3x+5