10.1#5

When I type the equation of a sphere, it is saying that the "=" is an
"unexpected character" and is counting it wrong.  Is there some way Webwork
is expecting me to write the equation of a sphere without using "="?

****************
Notice how webwork has those "=0"s over at the right hand side?  So, for example, what you've written amounts to (x+7)^2+(y-5)^2+(z-8)^2=9=0, which makes no sense.  You could have written
(x+7)^2+(y-5)^2+(z-8)^2=9, if webwork would have let you, but it didn't.  Instead you need to write

(x+7)^2+(y-5)^2+(z-8)^2-9, so that (x+7)^2+(y-5)^2+(z-8)^2-9=0 makes sense.