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(x4+6x3+5x2-10x3-60x2-50x+21x2+126x+110)=1680
(x4-4x3-34x2+76x+110) = 1680
x4 - 4x3 - 34x2 + 76 x + 110 - 1680 = 0
x4 - 4x3 - 34x2 + 76 x - 1570 = 0
cari yang begini ya?