What number should be subtracted from 
to get
?
Suppose x be the rational number to be subtracted to 
to get 
Then,
- x = 
– 
= 
- 
= 
= 
-5 – 3x = 
-3x = 
+ 5
-3x = 
-3x = 
-3x = 
-18x = 45
x = 
x = 
Therefore,
The required number x = 
10
What number should be subtracted from to get ?
Suppose x be the rational number to be subtracted to to get
Then,
- x =
– =
- =
=
-5 – 3x =
-3x = + 5
-3x =
-3x =
-3x =
-18x = 45
x =
x =
Therefore,
The required number x =