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7a+7ab-3b-3ab
7a+7ab-3ab-3b
7a+4ab-3b
B.b(3-x)
---------
x(c-3)
= 7a -3b + 7ab - 3ab
= 7a - 3b + 4ab
B. 3b - bx
---------
cx - 3x
= b
----
cx
yang B aku kurang yakin..... tapi kalau gak salah itu jawabannya. kalau salah sorry ya