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(3x-2y)/(x+y) = 9/4 ....kali silang
4(3x - 2y) = 9(x+y)
12x - 8y = 9x + 9y
12x -9x = 9y +8y
3x = 17 y
nilau y / 3x = y/ (17 y) = 1/17