Question

-7c+9=c+1
If you could also show how you did it i would appreciate it

Answer 1

-7c+9=c+1    (subtract c on both sides)
-8c+9=1    (subtract 9 on both sides)
-8c=-8     (divide by -8 on both sides to get c by its self)
c=1
your answer is 1.

Answer 2

c = 1

-7c + 9 = c + 1
+7c        +7c        (combine light terms)

9 = 8c + 1
-1        -1          (do the math)

8 = 8c
_    _           (divide by 8 on both side)
8    8

1 = c