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b.) 12 x (-23 + 31) = (12 x -23) + (12 x 31) = -276 + 372 = 96
c.) 25 x (-12 + (-16)) = (25 x -12) + (25 x -16) = -300 - 400 = -700
d.) -55 x (-26 - (-42)) = (-55 x -26) + (-55 x 42) = 1430 - 2310 = -880