Tìm x: 3x – 2 = 19, [43 - (56 - x)].12 = 384, 3x.2 + 15 = 33

 Tìm x

a)   3x – 2 = 19

b)    [43 - (56 - x)].12 = 384

c) 3x.2 + 15 = 33                                                  

d) 2x – 6 = 12

e) [(2x – 11):3 + 1].5 = 20                                     

 f) 2.3x = 10.312 + 8.274