(()(()))
(()))
(This((is a properly)()nested)((set))of(parentheses).)
((But)(this)((is())not.)
(a6/x)*((34y)-((a1+3)*(a2+a5+10)))/(5c))
(11)((1(22)(11)
(a6/x)*((34y))-((a1+3)*(a2+a5+10)))/(5c)
(This is a ()(())(test...)(Hi( my name is BUTTHEAD	))