Set up equations and solve them to find the unknown numbers in the following cases:

Munna subtracts thrice the number of notebooks he has from 50, he finds the result to be 8

Dear Student

Let us assume the required number be x
Thrice the number = 3x
The given above statement can be written in the equation form as,
= 50–3x = 8
By transposing 50 from LHS to RHS it becomes - 50
= - 3x = 8 - 50
= -3x = - 42
Then,
Divide both side by -3,
= (-3x/-3) = - 42/-3
= x = 14

Thanks