Answer :

93+(68+7)

=93+68+7

=100+68

=168

(1)First you your supposed to do the (inside of parenthesis ALWAYS!) 
so for example:
(2)93+ (75)  < ------68+7= 75
(3) Then you do whats left on the outside! 
for example: 93+75= 168-----> 168 is your answer!
do you get it? I'm going to give you one more problem in case!

250- (23+34) 

remember always do whats in the parenthesis first!

(1) 250 - (57)
(2) gather everything of whats left outside after you do whats in the parenthesis first! so lastly its------> 250-57= 193!