If the first step in the solution of the equation -x 6=5-3x is "subtract 5," then what should the next step be

How many different three-digit numbers can be formed using the digits 1 comma 2 comma 9 comma 6 comma 4 comma 3 comma and 8 without repetition? for example, 664 is not allowed.

Atransformation t : (x,y) (x-5,y +3) the image of a(2,-1) is

Which of the following constants can be added to x2 - 3x to form a perfect square trinomial?