Problems using samples

[Raphael Ribeiro]

1 x = 8
2 y = 4
3 v = x - y
4
5 print v
6 if x = y:
7	print "Eles são o mesmo valor"
8	else:
		print "Eles não são iguais , manja?"

this is my code, it says there's an error in line 6, but i can't find
what **** error is that, can anyone help me?