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20 + 15 ≠ -15
35 ≠ -15 Nie spełnia
b) -5 + 5 ≠ -10
0 ≠ -10 Nie spełnia
c) 2 × (-5) - 7 = 4 × (-5) + 3
-10 - 7 = -20 + 3
-17 = -17 Spełnia
1 = 1