Question

x + x + 20 = 100 – 20

Answer 1

x+x+20=100-20

x+x=100-20-20

2x= 60

x=30

Espero ter ajudado :)

Answer 2

Resposta:

x + x + 20 = 100 - 2

2x + 20 = 98

2x = 98 - 20

2x = 78

x = 78/2

x = 39