Improve IQ - Fix The Equation  

There are 25 Matchstick Puzzles (fix the equation) presented in this video, Give it a try before checking the solution. Comment if you found an alternate solution.

#5) 0+6=6

#13 8-3=5

#13 0 - 3 = -3 #19 2 - 3 = -1

#20) 8-1=7

#20 8-7=1

#5 0+6=6

2--7=8>>>>> 2+7=9

2+7=9