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a=1
3a+b=7
3 (1)+b=7
b=7-3
b=4
a+b+c=8
1+4+c=8
c=8-5
c=3
1n2 ( pangkat dua) +4n+3
1 (80)2 (pangkat dua)+4.80+3
6400+320+320
=6723