Vamos là.
a + b = 0
5a - b + 4 = 0
6a + 4 = 0
6a = -4
a = -2/3
b = 2/3
d + 2 = 0
d = -2
3c - 2 = 0
3c = 2
c = 2/3
la + cl = l-2/3 + 2/3l = 0
0*0 = 0 (A)
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Vamos là.
a + b = 0
5a - b + 4 = 0
6a + 4 = 0
6a = -4
a = -2/3
b = 2/3
d + 2 = 0
d = -2
3c - 2 = 0
3c = 2
c = 2/3
la + cl = l-2/3 + 2/3l = 0
0*0 = 0 (A)