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        "intro": "This introductory Section reminds you of important notations and conventions used throughout engineering mathematics. We discuss the arithmetic of numbers, the plus or minus sign, \\(\\pm\\), the modulus notation | |, and the factorial notation \\(!\\). We examine the order in which arithmetical operations are carried out. Symbols are introduced to represent physical quantities in formulae and equations. The topic of algebra deals with the manipulation of these symbols. The Section closes with an introduction to algebraic conventions. In what follows a working knowledge of the addition, subtraction, multiplication and division of numerical fractions is essential.",
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            "heading": "COMBINING NUMBERS TOGETHER USING +,\u2212,\u00d7,\u00f7",
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