45 - 56 =
78 - 90 =
566 - 709 =
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10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000+2000000000000000000000000000000000999999999999999999999999999999999999999999999999999999999999999999999999999999999999444444444444444444444444444444444444444477777777777777777777777777777777777777777777777777772222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222222299999999999999999999999999999922222222222222222222222222222222222222222999999999999922222222222222999999999999222222222222999999999999222222222229999999999992222222222=?
45-56=-11
78-90=-12
566-709=-143
45 - 56 = 45 + ( - 56 ) = ( - 56 ) - 45 = -11
78 - 90 = 78 + ( - 90 ) = ( - 90 ) - 78 = - 12
566 - 709 = 566 + ( -709 ) = ( - 709 ) - 566 = - 143