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a in (-oo:+oo)
(2/3)*a-11 = a+4 // - a+4
(2/3)*a-a-11-4 = 0
-1/3*a-15 = 0 // + 15
-1/3*a = 15 // : -1/3
a = 15/(-1/3)
a = -45
a = -45
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