(1963.33 ÷ 6.5 - 193.99)/? = 753.02 ÷ 26.98 (1963 ÷ 6.5 - 194)/? = 753 ÷ 27 => (302 - 194)/? = 28 => ? = 108/28 => ? = 3.85 = 4
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