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Over Keuken wrappen of verven

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Robert Recorde, The designer of the equals sign, introduced plus and minus to Britain in 1557 in The Whetstone of Witte:[14] "There be other twee signes in often use of which the first is made thus + and betokeneth more: the other is thus made − and betokeneth lesse." Esto https://www.metooo.it/u/6838a33c46214a486a45ace5
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