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7/u - 4/y = 2
maka
6y+2u = 21 uy untuk ruas ini dikali 2 menjadi 12 y + 4 u = 42 uy
7y-4u = 2 uy
12 y + 4 u = 42 uy
7 y - 4 u = 2 uy tambahkan
19 y = 44 uy
u = 19/44
7y - 4u = 2
7y - 4 x 19/44 = 2
7y = 2 + 19/11
7y = 41/11
y = 41/77
coba diperiksa lagi hitungannya ya