Question

what should be added to [1/4+--4/7] to get 1

Answer 1

Answer:

[1/4+(-4/7)] +x = 1

1/4-4/7+x=1

7/28-16/28+x=1

-9/28+28x/28=1

-9+28x=28

28x=28+9

28x=37

x=37/28