Arithmetic is a branch of mathematics that studies the numbers and the properties with them. The main properties are addition, subtraction, multiplication and division. Variables are non-constant values, so we use letters to assign a number to a variable and the operator that allows us to do this is =. For instance, if we have the variable x, we can say that this variable is equal to 4. Then:
Suppose the value of the variable changes to 5, then the new value of it is given by:
After adding 4x you will get 10= 6x+6. Next, you subtract 6 on both sides which will leave you with. 4=6x you then divide the 6 to the 4. You can also reduce which will give you the answer 2/3.