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-24 = ac + ad + bc + bd
-24 = a(c+d) + b(c+d)
-24 = (a+b)(c+d)
Substitusikan:
-24 = (a+b)(8)
Jadikan:
a + b = -3
Sehingga berlaku:
(a+b+c+d)
= (a+b) + (c+d)
= -3 + 8
= 5