3y + 7 = 25 would be an example of an equation.
In this simple example, we first move the real numbers to one side, by subtracting 7 from both sides.
3y = 18. From this t is obvious that y = 6.
and to finish, we try that solution. (3 x 6) + 7 = 25. Indeed it is so.
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It is called solving by elimination.
Because linear equations are based on algebra equal to each other whereas literal equations are based on solving for one variable.
Equations = the method
The first step is to show the equations which have not been shown.
(k + 1)(k - 5)= 0