Question

56-x=33
X+20=45
X-7=8
9+x=17

Answer 1

56 - х = 33
х = 56 - 33
х = 23

х + 20 = 45
х = 45 - 20
х = 25

х - 7 = 8
х = 8 + 7
х = 15

9 + х = 17
х = 17 - 9 
х = 8