book Maths Puzzle Numerical Ability

solve listing any restrictions
x/x^2+5x-14 +2/x-2 =1/x+7

does x = -8

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book Other Question

The ratio of the volume of two spheres is 216:125. What is the ratio of their diameters? I don't understand Factoring Trinomials. Can you show me step-by-step how to get the answer to this problem: {{{2b^2+10b+12}}}