319.995 × 15.98 ÷ 4.002 - ? × 7.95 = 1679.89 ÷ 2.005
ATQ, 319.995 × 15.98 ÷ 4.002 - ? × 7.95 = 1679.89 ÷ 2.005 Or, 320 × (16 ÷ 4) - ? × 8 ~ 1680 ÷ 2 Or, 320 X 4 - ? X 8 ~ 840 Or, ? × 8 ~ 1280 - 840 Or, ? × 8 ~ 440 Or, ? ~ (440 ÷ 8) So, ? ~ 55
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