74. Решите уравнения: x − 3 = 9; x + 4 = 5; x − 8 = 7; x + 2 = 8; x − 6 = 9; x + 2 = 7; x − 3 = 6; x − 9 = 10; x + 4 = 6; x − 5 = 4; x − 12 = 9; x + 3 = 7; x − 11 = 16; x − 7 = 18; x − 12 = 19; x + 5 = 5; x − 3 = 4; x + 8 = 10; x + x = 70; x + x = 73; x + 7 = 9; x − 4 = 6; x + 12 = 21; 32 + x = 74; 62 + x = 79; x + 9 = 16; x − 3 = 5; x + 17 = 31; 64 + x = 71; 39 + x = 64.