Question

Решите 12 = (7x – 9) – (11 – x)

Answer 1

12=7x-9-11+x
12+9+11=7x+x
32=8x
x=32/8
x=4

Answer 2

12=(7х-9)-(11-х)
12=7х-9-11+х
7х-9-11+х=12
7х+х=12+9+11
8х=32
х=32:8
х=4