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-18+(-11--9,5)=-18+(-11+9,5)=-18+-1,5=-19,5
2.
2,2+2/7-1,2-1i5/7=1-1i3/7=-3/7
-18+[-11-(-9,5)]=-18+(-11+9,5)=-18-1,5=-19,5
2]
2,2+²/₇+(-1,2)+(-1⁵/₇)=¹¹/₅+²/₇-⁶/₅-¹²/₇=-³/₇