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