20 Difficult Matchstick Puzzles Only People with High IQ Can Solve

The bonus question is very cool, let's see who can solve it?

20 Difficult Matchstick Puzzles Only People with High IQ Can Solve, Give it a try before checking the solution. Comment if you found an alternate solution.

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[calinhanca]

#9 => 9 - 9 = 1 - 1
#9 => 3 + 8 = 11

[sy]

My answer of the #Bonus: 4+9+5 (= 18) [By the way, " 49+8 " (=57) is OK? ]
[Or ・・・ " 4-3+6! " (=721) is OK? ; One matchstick can be " ! " . ]

[rajeevshrotriya]

Answer to question no. 5 can also be 8-3=5