When I finish my work, I will call you 
-> If
Don't go out or you will not have enough time to do your test
-> If
Do more exercise or you will not improve your health
-> If you don't
Protect the environment or environmental will be contaminated
-> If
Reduce light pollution or animal will change their behaviour patterns
-> If
Reduce light pollution or animal will change their behaviour patterns
-> If
Decrease water temperature or some aquatic creatures will be unable to reproduce
-> If
Don't increase the water pollution or we will get more sickness
-> If

Giải phương trình: 1/x-3/2x=1/5

Tại sao bánh xe máy cày, máy xúc đất phải làm thật to?