Answer:
X = -1
Step-by-step explanation:
x=-1
8x+1=−8−x
8x+1=−8+−x
8x+1=−x−8
8x+1+x=−x−8+x
9x+1=−8
9x+1−1=−8−1
9x=−9
9x9=−99
x=−1