Oh, dude, it's like you take x and then you're like, "Hey x, I want you to chill out and be 15 less than yourself." So, you just subtract 15 from x and boom, you've got 15 less than x. Easy peasy lemon squeezy.
15.x-12
X+15
"< 0" For example x < 0 means "x less than zero".
X<a x>b
x is less than or equal to negative 3 or x< or =-3
15.x-12
X+15
x-15, x represents the unknown number, and to have 15 less you would simply subtract 15 from x.... therefore your answer is x-15
It is X <= 15.
"< 0" For example x < 0 means "x less than zero".
x - 4
x is less than or equal to 15
X<a x>b
x² - 15
x - 10
5-x
x is less than or equal to negative 3 or x< or =-3