book Maths Puzzle Numerical Ability

the sum of twice a number and five

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book Other Question

please simplfy this
(4x^3-6x^2+5)-(x^2+7x^2-8x-2) I need to know the symbols that is used to show the relationship between 2 intersecting lines. I know if the lines (AB and DC) are parallel the answer would be AB // DC, but what