from fractions import Fraction
def equinox(a,b,m,n):
    x = (n*a[0]+m*b[0])/(m+n)
    y = (n*a[1]+m*b[1])/(m+n)
    return (x,y)
A = (Fraction('-1/2'),Fraction('4/3'))
B = (Fraction('2/3'),Fraction('-4'))
m = 3
n = 2
C = equinox(A,B,m,n)
print('x座標は',C[0],' y座標は',C[1])