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W + P = 63
E + P = 49
Substitusi
W + P = 63
61 - E + P = 63
- E + P = 63 - 61
- E + P = 2
Eliminasi
E + P = 49
-E + P = 2 +
2P = 51
P = 51/2
P = 25.5 kg
W + E + P = 61 + 25,5 = 86,5 kg
W+P=63kg
61+P=63
P=63-61=2 kg
E+P=49
E+2=49
E=49-2=47 kg
W+P+E=61+2+47= 110 kg