10 + 5= - 15, 10 - 3= - 7, 6 + 4 = - 10, 2 + 2= - 4, 6 + 3= - 9, 2 + 3= - 5, 1 - 1= - 0, 4 + 2 + 2= - 8,

Maths #1

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