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2x+3y = 7.5 .... kalikan 2
..
4x + 2y = 5
4x + 6y = 15
kurangkan
-4y = - 10
y = 10/4 = 5/2 sub ke 4x + 2y = 5
4x + 2(5/2) = 5
4x + 5 = 5
4x = 0
x = 0
HP (0, 5/2)