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__________×3
= 1 (×+5) = 21
= × + 5 = 21
= × = -5 + 21
= × = 16
b. 2× - 3/3 + 4× + 4/2 = 2× + 3
_______________________×6
= 12× -6 + 24× + 12 = 8× + 18
= 12× + 24× - 8× = 6 - 12 + 18
= 28× = 12
= × = 0,42