You can't use 'just as' with a negative in this way. I can't think of any explanation as to why that is an exception, maybe it's just one of those English quirks, but you can't. fairly straightforward statement.
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soheil1 in a chess context, the move 1.d4] is just as good as [the move] 1.e4.what if 'just' is deleted?'Just' is an intensifier. You may remove it without damaging the grammar of the sentence.