X x 37,5 + 62,5 x X =184,8              19,5 x X – 9,5 = 34,87

X x 1,5 = 8,6 x 15 + 4,5                                              3,24 x X- 0,38=21,12

(X – 12,7) : 0,48 = 427 ,5                                     20,49 + x = 7,25 x 6,28

19,5 – X x 6,3 = 11,625                                             4,75 + x : 9,4 = 34,266

93,68 – X : 3,6 = 91,38                                           27,72 : 3 + X x 6 = 28,44

T ìm X

125,5 : 5 + X = 37,86                                                     34,27 : 0,1 – X = 89,02

T ìm X

X + 3,25 x 8,2 = 38,89                                                X + 18,26 : 2 = 112,87