Numeric.SpecFunctions:invIncompleteBetaWorker from math-functions-0.1.5.2, C

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\[x \cdot \left(\frac{y}{z} - \frac{t}{1 - z}\right) \]
(FPCore (x y z t) :precision binary64 (* x (- (/ y z) (/ t (- 1.0 z)))))
double code(double x, double y, double z, double t) {
	return x * ((y / z) - (t / (1.0 - z)));
}
real(8) function code(x, y, z, t)
    real(8), intent (in) :: x
    real(8), intent (in) :: y
    real(8), intent (in) :: z
    real(8), intent (in) :: t
    code = x * ((y / z) - (t / (1.0d0 - z)))
end function
public static double code(double x, double y, double z, double t) {
	return x * ((y / z) - (t / (1.0 - z)));
}
def code(x, y, z, t):
	return x * ((y / z) - (t / (1.0 - z)))
function code(x, y, z, t)
	return Float64(x * Float64(Float64(y / z) - Float64(t / Float64(1.0 - z))))
end
function tmp = code(x, y, z, t)
	tmp = x * ((y / z) - (t / (1.0 - z)));
end
code[x_, y_, z_, t_] := N[(x * N[(N[(y / z), $MachinePrecision] - N[(t / N[(1.0 - z), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]), $MachinePrecision]
x \cdot \left(\frac{y}{z} - \frac{t}{1 - z}\right)