How do you do -9x-3 equals 60?

That depends on what exactly you want to 'do' with it.

If you want to write it in a way that will attract some attention,

a peacock-blue felt-tip marker could work well for you.

If you want to solve it for 'x', you could do it like this:

-9x - 3 = 60

Add 3 to each side:

-9x = 63

Multiply each side by -1 :

9x = -63

Divide each side by 9:

x = -7