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x/3 - y/4 = 1 <=> 4x/12 + 3y/12 = 1. || (x3)
jadi,
12x/12 + 8y/12 = 20
12x/12 + 9y/12 = 3
---------------------------- -
-y/12. = 17
-y. = 17.12
-y. = 204
y. = -204
x nya cari sendiri pakai rumus x/2 + y/3 = 10 yang dikalikan 6 semua jadi 3x +2y = 60