We will investigate how to solve an equation consisting of one variable
We have the following equation at hand:

The basic rule applied in solving equation like above is mathematical operations. We apply basic operations like:

on both sides of the equation accompained by a variable or a number in an attempt to isolate the variable ( k ).
To isolate the variable ( k ) we need all the terms involving the variable ( k ) on one side of the equation.
We will add ( 4k ) on both sides of the equation as follows:

Now to remove the negative sign accompained by ( k ) on the right hand side of the equation. We wil multiply both sides with ( -1 ) as follows:

Hence, the value of ( k ) is:
