5/6 - a/b + 2/3 = 4/3
5/6 - a/b = 4/3 - 2/3
5/6 - a/b = 2/3
a/b = 5/6 - 2/3
a/b = 5/6 - 4/6
a/b = 2/6 = 1/3
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5/6 - a/b + 2/3 = 4/3
5/6 - a/b = 4/3 - 2/3
5/6 - a/b = 2/3
a/b = 5/6 - 2/3
a/b = 5/6 - 4/6
a/b = 2/6 = 1/3