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a in (-oo:+oo)
3/4-a = a-(5/36) // - a-(5/36)
3/4-a-a+5/36 = 0
8/9-2*a = 0 // - 8/9
-2*a = -8/9 // : -2
a = -8/9/(-2)
a = 4/9
a = 4/9
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