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a + 10b = 48
U8 = 20
a + 7b = 20
eliminasi
a + 10b = 48
a + 7b = 20
___________ -
3b = 28
b = 28/3
a + 7b = 20
a + 7 ( 28/3) = 20
a + 196/3 = 20
a = 20 - 1966/3
a = -136/3
itu yang ditanya jumlah apa ya ?
oh iya maaf kalau salah. karna saya juga ragu sama soalnya.