The curve for which \(\frac{\mathrm{d}y}{\mathrm{d}x} = \frac{a}{(1-2x)^2} + 3\), where \(a\) is a constant, is such that the tangent to the curve at \((1, -3)\) is perpendicular to the line \(7y + x + 20 = 0\).
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