book Maths Puzzle Numerical Ability

combine and simplify. if necessary list the domain 7/(2x)+ 1/(x-2)

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book Other Question

I'm sorry this is so long but i tried really hard and cannot answer this question!

Pedro can buy Texas oli, priced at 30 dollars per gallon and California oil priced at 15 dolla 1/x+2 + x-2/x-5 + 4x+3/x^2-3x-10