Turn the wrong equation into correct | Matchstick puzzle 7-7=17

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 3-7=8
2) Matchstick puzzle 1-4=9
3) Matchstick puzzle 1+8=5
4) Matchstick puzzle 8-7=13
5) Matchstick puzzle 7-7=17
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