0
a = undefined.
3 + a - 6 - 4 = a - 7
a - 7 = undefined
a = undefined.
The problem is... you're basically saying "5 + a". What's "a". You're not saying that 5 + a = anything. Just 5 + a, or 3 - a - 6 - 4 in this case.
If the answer was say 7, then:
3 + a - 6 - 4 = 7
a = 7 - 3 + 6 + 4 = 14
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