how to program adder and subtractor using PIC16f84a

hi everyone. it's my first time to post here. can anybody help me with
my problem? please teach me how to program adder and subtracter
using PIC16f84a. our project proposal in our school is to provide a
low cost digital scoreboard. we will use pic16f84a to add and subtract
points of the teams. we used 3 seven segment display to display
the points of each team. but, we are having hard time on how to program
in adding and subtracting points using pic16f84a to drive into a 3
seven segment display. hoping for a positive reply guys. please share
your talents. God bless you guys.
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