143 + 426 = - 569, 409 + 282 = - 691, 256 - 185 = - 71, 523 - 214 = - 309, 8 x 4 = - 32, 16 x 7 = - 112, 23 x 54 = - 1,242, 42 / 7 = - 6, 121 / 11 = - 11, 360 / 8 = - 45,

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