[Haskell-beginners] annoying precedence of unary negate

[ ⋯ , translate (-50) 0 $ color green $ Circle 50 , ⋯] The parens around -50 are necessary. Is there a more elegant way to write it? Without the parens, I don't understand what the compiler sees it as, based on the error message. How does the compiler parse it in that case? Also, is the comma in a list different from the operator comma which is noted as right-associative precedence 5? I had thought that the item separator in the list was special syntax that had very low precedence. After all, I can write f$g as a list item without parens, and $ is lower than comma. What is comma (as an operator) used for?