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y=5-2x
kemudian disubs 3x+4y=1
3x+4(5-2x)=1
3x+20-8x=1
-5x=-19
x=19/5
kemudian cari y=5-2x
y=5-2(19/5)
y =5-38/5
y=25/5-38/5
y=-13/5