a/ 12x - 33 = 32 . 32
=> 12x - 33 = 35 = 243
=> 12x = 243 + 33 = 276
=> x = 276 : 12 = 23
b/ 148 + (78 + x) = 244
=> 78 + x = 148 - 244 = -96
=> x = -96 - 78 = -174
c/ 45 - x = 49 + 52
=> 45 - x = 101
=> x = 45 - 101 = -56
d/ 707 - 3(x + 34) = 407
=> 3(x + 34) = 707 - 407 = 300
=> x + 34 = 300 : 3 = 100
=> x = 100 - 34 = 66
e/ 25.3 - x = 104
=> 75 - x = 104
=> x = 75 - 104 = -29