31+(25-7x)-(11-2)=0
31 + 25 – 7x – 11 + 2 = 0
– 7x = 0 – 2 + 11 – 25 – 31
-7x = -47
x = -47/-7
х=6,71428571429
31+(25-7x)-(11-2)=0
31 + 25 – 7x – 11 + 2 = 0
– 7x = 0 – 2 + 11 – 25 – 31
-7x = -47
x = -47/-7
х=6,71428571429