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(3 / 2x + 5) + (2 / 6x^2 + 7x -20) =
(3 / 2x + 5) + (2 / (2x + 5)(3x - 4)) =
(3 (3x - 4) + 2) / (2x + 5)(3x - 4) =
(9x - 12 + 2) / (2x + 5)(3x - 4) =
9x - 10 / (2x + 5)(3x - 4)
klo yang nomor c, jawabannya menurut gue adalah:
(4ax - 12axy) / 36ax
tapi gak tahu juga deh.
sorry ya, klo salah...