In Arithmetic, subtraction operation involves two or more numbers and subtraction operator i.e (-)
When one number(11) is subtracted from another(20), it is indicated as 20 - 11.

For Example = Show subtraction operation on the following pair of numbers.
(15, 10) = 15 - 10
(18, 9) = 18 - 9
(152, 4, 71) = 152 - 4 - 71
(191, 12, 143, 4) = 191 - 12 - 143 - 4

In algebra, subtraction operation involves two or more literal numbers and subtraction operator i.e (-)
When one literal number(r) is subtracted from another literal number (s), it is indicated as s - r.

For Example = Show subtraction operation on the following pair of literal numbers.
(p, q) = p - q
(g, h) = g - h
(x, y, z) = x - y - z
(p, q, r, s) = p - q - r - s