1) 14 = 2у - 2, 2) 6х + 5 = 7х + 3, 3) 11m - 13 = 15 - 3m,
-2у = -2 - 14, 6х - 7х = 3 - 5, 11m + 3m = 15 + 13,
-2у = -16, -х = -2, 14m = 28,
у = -16 : (-2), х = 2; m = 28 : 14,
у = 8; m = 2;
4) -10z + 75 = -5z, 5) 28 = 7n - 7, 6) 30 - 15z = 40 - 14z,
-10z + 5z = -75, -7n = -7 - 28, -15z + 14z = 40 - 30,
-5z = -75, -7n = -35, -z = 10,
z = -75 : (-5), n = -35 : (-7), z = -10.
z = 15; n = 5;