x/2 + y/2 = 7/5
x/2 - y/2 = 7/12 subtract the second equation from the first
y = 7/5 - 7/12 = [84 - 35 ] 60 = 49/60
And using either equation
x/2 + (49/60)/2 = 7/5 multiply through by 2
x + 49/60 = 14/5
x = 14/5 - 49/60
x = 168 / 60 - 49/60 = 119 / 60