book Maths Puzzle Numerical Ability

solve 2x - 5 = 5x + 13

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book Other Question

let X be a linear space and let Y be a subspace of X. show that the direct sum of Y and X/Y is isomorphic to X.
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(this is a question from a graduate clas
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A line is 5.6 units long and has one point at (5.1, 6.3). The sum of the coordinates of the unknown endpoint is 15.3. What are the coor