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-(-1 i 1/30 + (-15) = - (-16 1/30) = 16 1/30
-(-9) - (-4 i 1/4) = 9 + 4 1/4 = 13 1/4
(-3 i 2/5) - 4,8 = -3,4 - 4,8 = -8,2
2 i 3/5 + (-5 i 3/5) = 2 3/5 - 5 3/5 = -3