Question

13+10х=163
z:8-6=49
49а-а=384

Answer 1

1)
13 + 10x = 163
10x = 150
x = 15

2)
z/8 - 6 = 49
z/8 = 55
z = 440

49a - a = 384
48a = 384
a = 8 

Answer 2

13+10х=163
10х=163-13
10х=150
х=150/10
х=15

z/8-6=49
z/8=49+6
z/8=55
z=55*8
z=440

49a-a=384
48a=384
a=384/48
a=8