Question

(15-x)+(x+12)=40-(x+5)

Answer 1

x+12=40-x-5-15-x

x+12=40-5-15-x-x

x+12=20

x=20-12=8

Answer 2

x+12 = 40- x- 5- 15- x

x+12 = 40 - 5 - 15- x- x

x + 12 = 20

x = 20 - 12

x = 8

Answer 3

x+12 = 40- x- 5- 15- x

x+12 = 40 - 5 - 15- x- x

x + 12 = 20

x = 20 - 12

x = 8

Vậy x = 8