A) X + 76 = 52 C) 4X

Bài 2 (2,0 điểm): Tìm x

∈

Z, biết:

a) x + 76 = 52

c)

4

^x

.7 – 398 = 50

b) 78 - (5x – 14 ) = 47

d) 2.| x+2 | = 68+ (-50)