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ac-ad+bc-bd dari 2ac+ad+2bc+bd
klo dari di balik pengurangannya
2ac+ad+2bc+bd - ac-ad+bc-bd
2ac-ac+ad-ad+2bc+bc+bd-bd
1ac+3bc
(a+b) (2c+d) - (a+b) (c-d)
2ac+ad+2bc+bd
ac - ad+ bc- bd
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ac+2ad+bc+2bd