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import sympy
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d1, d2, CW = sympy.symbols('d1 d2 CW')
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eq1 = sympy.Eq( (d2 - d1)/d2 - CW)
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exr = sympy.solve(eq1,d2)
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type(exr)
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type(exr[0])
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expr = exr[0]
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expr2 = expr.subs(2, d1)
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expr2
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exp2 = sympy.expr(exr[0])
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