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.
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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