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In algebra 1 lessons, we come across two types of symbols, namely

· Constants

· Variables.

For example: - 5, 30, 246, -7, 5 / 3, 7 / 9, 80.5, -9.6, etc.

Whereas a symbol whose value changes with situation is known as a variable, such as; x, y, p, q, 5x, 7z, etc

Similarly, 3 is a constant and x is variable but together each of 3 + x, x – 3, x ÷ 3, etc. is a variable.

So, we can say that every combination of a constant and a variable is always a variable.

This combination of constant and variable is known as an expression and the value of the expression depend on the value (s)

of its variable (s).

· 3 + x

· x – 3

· x ÷ 3

For a given equation if the value of a variable is unknown, then the equation is solved to find the value of the variable.

Different algebraic operations are used in order to solve the given equation.

5x – 15 = 20

Add 15 on both sides of the equation.

5x -15 +15 = 20 + 15

5x = 35

Now, divide by 5 on both sides of the equation.

5x/5 = 35/5;

x = 7

For a given equation, the value can be calculated by plugging the value of variable in the equation

x-3 = 0 – 3 = - 3