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-7/3 = 3-(-4)/-2-a
-7/3 = 7/-2-a
(kali silang)
-7/3 (-2-a) = 7
14/3+7/3a = 7
7/3a = 7-14/3
(semua dikali 3)
7a = 21-14
7a = 7
a = 1