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a in (-oo:+oo)
15 = (1/3)*a-11 // - (1/3)*a-11
11-((1/3)*a)+15 = 0
(-1/3)*a+11+15 = 0
26-1/3*a = 0 // - 26
-1/3*a = -26 // : -1/3
a = -26/(-1/3)
a = 78
a = 78
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