+20/-4 = -20/4 = -5
+27/-3 = -27/3 = -9
-90/-5 = 90/5 = 18
-5 - (-9) * (-2) + 18 = -5
-5 - (+18) +18 =-5
-5 -18 + 18 = -5
-5 = -5
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+20/-4 = -20/4 = -5
+27/-3 = -27/3 = -9
-90/-5 = 90/5 = 18
-5 - (-9) * (-2) + 18 = -5
-5 - (+18) +18 =-5
-5 -18 + 18 = -5
-5 = -5