Răspuns :
4 y - 12 = 20 + 2 y
4 y - 2 y = 20 + 12
2 y = 32
y = 32 : 2
y = 16
Verific:
4 x 16 - 12 = 20 + 2 x 16
64 - 12 = 20 + 32
52 = 52 ( A )
4 y - 12 = 20 + 2 y
4 y - 2 y = 20 + 12
2 y = 32
y = 32 : 2
Verific:
4 x 16 - 12 = 20 + 2 x 16
64 - 12 = 20 + 32
52 = 52 ( A )