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persamaannnya :
a + b = 100
a - b = 40
SPLDV (Sistem Persamaan Linear Dua Variabel)....ok?
a - b = 40
a + b = 100
a - b = 40
========= +
2a = 140
a = 70
a + b = 100
70 + b = 100
b = 30
bener apa salah??
kalo salah maapin ya :)