10 - 2x5= ?, 16 - 2x8= ?, 6 - 2x3= ?, 8 - 2x4= ?, 4 - 2x2= ?, 12 - 2x6= ?, 14 - 2x7= ?, 2 - 2x1= ?, 18 - 2x9= ?, 20 - 2x10= ?,

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