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-2/a = 1/10
-2 x 10 = a
a = -20
penjumlahan akar = -b/a = -b/(-20) = 1/5 + 1/2 = 2/10 + 5/10 = 7/10
b/20 = 7/10
b = 7/10 x 20
b = 14