The glass is empty and full, because:
0.5 empty glasses = 0.5 full glasses
2 x 0.5 empty glasses = 2 x 0.5 full glasses
1 empty glass = 1 full glass
It’s just like eating the cake and keeping the cake… I mean pity those who eat the cake and doesn’t get to keep it, right?
Talkwards 
x = 2x
x/x = 2x/x
1 = 2
Wee! 🙂
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Hehehe, in fact what the post says is:
0.5 x = 0.5 y
2 * 0.5 x = 2 * 0.5 y
x = y
😛
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