<PRE><B>Question 346786</B>
Do not use the letter x to represent multiplication in algebra because x is 


used a lot as a variable and will produce confusion. In place of x, use * or 


parentheses, which also represent multiplication.


We are looking for n. 


This equation is called a linear equation.


4 x (9+3)= (4 x n) + (4 x 3)


4 * 12 = 4*n + 12


48 = 4n + 12


48 - 12 = 4n


36 = 4n


To find the value of n simply divide 36 by 4 and we are done.


36/4 = n


9 = n


The answer is 9.


=================

Here is the proof:


In the original equation given, let n = 9.  If we get the same answer on both 


sides of the equation, then we know for sure that n = 9 in this sample.


Let n = 9


4 x (9+3)= (4 x n) + (4 x 3)


4 x (9+3)= (4 x 9) + (4 x 3)


4 * 12 = 36 + 12


48 = 48....It checks!!


We now know for sure that n = 9.


By former substitute teacher.







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