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a -2/3 + a - 3/4 = 5/6 a - 5/4
a + a - 5/6 a = 2/3 + 3/4 - 5/4
2a - 5/6 a = 2/3 + 3/4 - 5/4
12/6a - 5/6a = 8/12 + 9/12 - 15/12
7/6a = 2/12
7/6a = 1/6
a = 1/6 : 7/6
a 1/6 × 6/7
a = 6/42
a = 1/7