Solve $x - 4 = 9$

Hint: The addition is the sum of given two or more than two numbers, or variables and in addition, if we sum the two or more numbers then we obtain a new frame of the number will be found, also in subtraction which is the minus of given two or more than two numbers, but here comes with the condition that in subtraction the greater number sign represented in the number will stay constant example $2 - 3 = - 1$

Complete step by step answer:
Since from given, we asked to calculate the unknown value of the given variable $x$ with the given linear equation of $x - 4 = 9$
Let us make use of the addition operation with the number $4$ is added on both sides of the given equation then we have $x - 4 = 9 \Rightarrow x - 4 + 4 = 9 + 4$
Since equal values with the positive signs get cancel like $1 - 1 = 0, - 2 + 2 = 0$ then we have $x - 4 + 4 = 9 + 4 \Rightarrow x + 0 = 9 + 4$
Since zero is added to any other number of variables will stay constant then we get $x = 9 + 4$
Again, making use of the addition operation we get $x = 13$ which is the required value of the variable.
Thus, we have $x = 13$

Note:
Also, the subtraction operation works like $9 - 4 = 5,4 - 9 = - 5$
The other two operations are multiplication and division operations.
Since multiplicand refers to the number multiplied. Also, a multiplier refers to multiplying the first number. Have a look at an example; while multiplying $5 \times 7$the number $5$ is called the multiplicand and the number $7$ is called the multiplier. Like $2 \times 3 = 6$ or which can be also expressed in the form of $2 + 2 + 2(3times)$
The process of the inverse of the multiplication method is called division. Like $x \times y = z$is multiplication thus the division sees as $x = \dfrac{z}{y}$. Like $y = - \dfrac{{33}}{{11}} \Rightarrow - 3$