Add 6x and x to have 7x.
-1+6x+x=-1
7x-1=-1
+1=+1
7x=0
Divide 7x by 7 so the x can be left alone.
X=0
The answer is d x-7 because it's seven less than a number
What is ttm mean? And what do you mean by points?
Yes you can simplify an improper fraction
