book Maths Puzzle Numerical Ability

x+1/x + x-3/4 = 1/6

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This question is from Chemistry class "Chemical Equilibrium" -I just cannot figure it out, I've been trying for the last 3 hours to solve it. I will give you the answere as copied simplify 4x-5(x-7) a -x + 35 b) -x-35 c) -x-7 d) 9x+35