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------------------ = 83
L + P
79L + 85P = 83 (L+P)
79L + 85P = 83L + 83P
85P - 83P = 83L - 79L
2P = 4L
P = 4/2 L
P = 2 L
L : P = L : 2L = 1:2
6715:83=80
L=79+80=159
p=85+80=165
jadi 159 : 165 trs sederhanakan sendiri