3+3= - 6, 7+7= - 14, 10+10= - 20, 1+1= - 2, 8+8= - 16, 2+2= - 4, 4+4= - 8, 5+5= - 10, 0+0= - 0, 6+6= - 12, 9+9= - 18,

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