Turn the wrong equation into correct | Matchstick Puzzle 1+7=3

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Turn the wrong equation into correct | Matchstick Puzzle 1+7=3
I was completely stumped by this last puzzle , but maybe you've already figured it out ? Please share your knowledge in the comments below !
You will see answer of these puzzles :-
1) Matchstick puzzle 2-6=7
2) Matchstick puzzle 7+5=4
3) Matchstick puzzle 6+5=4
4) Matchstick puzzle 5-4=7
5) Matchstick puzzle 1+7=3
6) Matchstick puzzle 5+7=0
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