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=2⅓ - 4⅔ * √¹²¹/₄₉ + 1 * 27 + 7 - 9 = 2⅓ - 4⅔ * ¹¹/₇ + 25 =
= 2⅓ - ¹⁴/₃ * ¹¹/₇ + 25 = 2⅓ - ²²/₃ + 25 = 2⅓ - 7⅓ + 25 = 20
60% * 20 = 0,6* 20 = 12
a=20
liczba przeciwna do a to -a czyli -20
liczba przeciwna do a to 1/a czyli 1/20