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= 1680
negatif x negatif = positif. jd hasil akhirnya positif 1680
= 7 × -4 = -28
= -28 × 3 = -84
= -84 × -4 = 336
= 336 × 5 = 1680
(-) × (-) = +
(+) × (-) = -
#semoga bermanfaat.