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x/2 + y/3 = 7 ==> 3x + 2y = 42
------------- +
6x = 48
x = 48/6 = 8
3(8) - 2y = 6
24 - 2y = 6
24 - 6 = 2y
18 = 2y
y = 18/2 = 9
berarti jawabanya D) (8,9)