A) 315 – 5(2X + 16) = 115 B) 2(X – 15) + 3

Bài 3 (1,5đ): Tìm x:

a) 315 – 5(2x + 16) = 115

b) 2(x – 15) + 3.6

2

= 10

5

: 10

2

c) 115 – 5[x – (43 – 39)

3

] = 85