When we say that two quantities are "equal to" each other, it means that they have the same value. In mathematics, we use the symbol "=" to show that two expressions or values are equal.
For example, in the equation 3 + 4 = 7, the expression on the left side of the equation is equal to the value on the right side, because 3 + 4 is indeed equal to 7.
Similarly, in the equation x = 5, it means that the variable x has the value of 5. This shows that x and 5 are equal to each other.
It's important to note that the "equal to" symbol is different from the "not equal to" symbol, which is represented by "≠". This symbol is used to show that two quantities are not equal to each other.