book Maths Puzzle Numerical Ability

2/3 - 5/6 = 1/x

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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 (1) 6a^-2 b^3 c^-2/12a^4 b c^-1