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Finding the value of a variable

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Solve the following equations for $y$. Enter your answers as fractions or integers and not decimals.

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$\\var{a}y + \\var{d} = \\var{b} +\\var{c}y$

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$y=\\;$[[0]]

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$\\displaystyle \\frac{\\var{m}}{y}+\\var{n}=\\frac{\\var{s}}{y}+\\var{t}$

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$y=\\;$[[0]]

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