The value we dont know is called a variable also called an unknown In this example of an open sentence x is a variable. And usually there will not be any heat transfer to the pump. What is on the left 7 2 is equal to what is on the right 10 1.
It is the second degree equation in which one variable contains the variable with an exponent of 2.
Sugarmate sugarmate X 4 7 is an open equation. We know that the standard equation is. So its the same thing as a open sentence. Consider the equation y 3 x 2 y 3 x 2 which is an example of a differential equation because it includes a derivative.