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2x + 3y = 7
2x + 3(7x-13) = 7
2x + 21x - 39 = 7
23x = 7+39
23x = 46
x = 2
KEMUDIAN
7x - y =13
7(2) - y = 13
14 - y =13
14 -13 = y
1 = y
JADI, nilai x, y = 2,1 Jawabannya D