-12+9 = -3
-6+-15 = -21
-9×8 = - 72
-48÷-4 = 12
-18-4 = -22
12-(-4) = 12 + 4 = 16
-10×-9 = + 90
-77÷7 = -1 1
-4 (8) = -32
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