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8b+6p=14.400 (dikali 5)
6b+5p=11.200 (dikali 6)
40b+30p=72.000
36b+30p=67.200
6
kedua persamaan dikurang menjadi
4b=4.800
b=4.800/4
b=1.200
6b+5p=11.200
6(1.200)+5p=11.200
7.200+5p=11.200
5p=11.200-7.200
5p=4.000
p=4.000/5
p=800
jadi
5b+8p
5(1.200)+8(800)
6.000+6.400=12.400