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Basic fraction arithmetic, giving answers in lowest form.

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\\[\\frac{\\var{a11}}{\\var{a21}} + \\frac{\\var{a12}}{\\var{a22}}\\]

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\\[\\frac{\\var{s11}}{\\var{s21}} - \\frac{\\var{s12}}{\\var{s22}}\\]

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\\[\\frac{\\var{m11}}{\\var{m21}} \\times \\frac{\\var{m12}}{\\var{m22}}\\]

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