х - 1/4 +3_1/12 =7_1/3
х - 1/4 = 7_1/3 - 3_1/12
х - 1/4 = 7_4/12 - 3_1/12
х - 1/4 = 4_3/12
х - 1/4 = 4_1/4
х = 4_1/4 + 1/4
х = 4_2/4
х = 4_1/2
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х - 1/4 +3_1/12 =7_1/3
х - 1/4 = 7_1/3 - 3_1/12
х - 1/4 = 7_4/12 - 3_1/12
х - 1/4 = 4_3/12
х - 1/4 = 4_1/4
х = 4_1/4 + 1/4
х = 4_2/4
х = 4_1/2