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-3a-3/7b=-3*1⅔-³/₇*-4=-3*⁵/₃-³/₇*-4=-5+¹²/₇=-5+1⁵/₇=-3²/₇
-2a+b= -2*1⅔+(-4)=-2*⁵/₃-4=-¹⁰/₃-4=-3¹/₃-4=-7¹/₃
mam nadzieję, że pomogłam ;)