Question

qual e a conta c+2c=2+c

Answer 1

c + 2c = 2 + c ==> c + 2c - c = 2 ==> 2c = 2 ==> c = 2/2 ==> c = 1.

Answer 2

c + 2c = 2 + c

c + 2c - c = 2

3c - c = 2

2c = 2

c = 2 / 2

c = 1

S = { 1 }