Question

12 = (7x – 9) – (11 – x)

Answer 1

12 = (7x – 9) – (11 – x)

12 = 7х - 9 - 11 + х

7х - 9 -11 + х = 12

8х = 12 +9 +11

8х = 32 I : 8

х = 4