9+4x=143 X:12=36 5x+4x-17=64 Решите уравнения)))

9 + 4x= 143

4x= 143-9

4x = 134

х = 134 : 4

x = 33.5

x : 12=36

x = 36 * 12

x = 432

5x + 4x - 17 = 64

9x = 64 + 17

9x = 81

x= 9