book Maths Puzzle Numerical Ability

Hi I'm not sure if I picked the right topic but I am trying to solve the following system of linear inequalities graphically. The problem is
3x-y is less than or equl to 6
x is

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book Other Question

Hello!
I really need help understanding polynomials. Could someone help me undestand how to factor this problem?

15x^2+13x-2

Thank very much!
2/3 - 5/6 = 1/x