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solve for t, x = (1-t)^3 * a + 3*(1-t)^2 + b + 3(1-t) * t^2 * c + t^3 *d
solve for t, x = (1-t)^3 * a + 3*(1-t)^2 + b + 3(1-t) * t^2 * c + t^3 *d
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