Question

а) 4х + 11х + 21 = 51;

б) 92 + 56 : (14 - х) = 100.

Answer 1

а)4х + 11х + 21 = 51;

15x=30,  x=2

б) 56:(14-x)=100-92

56:(14-x)=8

56=8*(14-x)

7=14-x

x=7