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= 15a +20 -3a² -4a +16a² -24a
= -3a² +16a² +15a -4a -24a +20
= 13a² -13a +20
Maka, koefisien dari a adalah -13 (d.).
15a+20-3a²-4a+16a²-24a
13a²-13a+20
koefisien a= -13(D)