Tìm x: a) x + 25749 = 42974 b) x + 4767 = 32938 c) x + 35254 = 70734

a) x + 25749 = 42974    b) x + 4767 = 32938    c) x + 35254 = 70734

x = 42974 – 25749    x = 32938 – 4767    x = 70734 – 35254

x = 17225    x = 28171    x = 35480