Answer:
90f - 8+x, if x>-8 0, if x=-8 8=x, if x<-8
90e - 20-x, if x>20 0, if x=20 x-20, if x<20
90d - x-8, if x>8 0, if x=8 8-x, if x<8
90c - 3x+12, if x >-4 0, if x=-4 3x+12, if x<-4
(I am not 100% sure, but i believe this is correct)
Step-by-step explanation:
Simplify all of the equations and have an x value with a number value. (Ex. x+4, x-19, etc.) When you have that, figure out what number to put in the slot so all are true, with the same numbers. Install it into the answer, and it should be correct.