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x in (-oo:+oo)
z/5 = x/y+4 // - x/y+4
z/5-(x/y)-4 = 0
x*(-y^-1)+1/5*z-4 = 0 // - 1/5*z-4
x*(-y^-1) = -(1/5*z-4) // : -y^-1
x = (-(1/5*z-4))/(-y^-1)
x = (4-(1/5*z))/(-y^-1)
x = (4-(1/5*z))/(-y^-1)
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