Interesting Math History

Question :
What is a 'Literal Equation' ?

Answer :
A Literal Equation is an equation in which letters are used to represent numbers.
In mathematics that arise in business and work it is often necessary to find the value of a Literal Expression when the numerical values of the letter variables are given. This process is known as evaluating the equation.
For Example,
Solve x for equation, ax + b = c
Now let us move b on other side, so equation becomes
ax = c - b
Now let us move a on other side, so equation becomes