In mathematics, a variable is a symbol used for a number not yet known,

while a constant is a number or symbol that has a fixed value.

The value of a variable can change depending on the equation,

while the value of a constant always remains the same.

In the equation 5x - 3 = 7, x is the variable, as it represents a number with an

unknown value.

The constants in the equation are 3 and 7, because their values remain the same

no matter how the equation may be altered.

The number 5 acts a coefficient for the variable x, as x is being multiplied by 5.