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a in (-oo:+oo)
99 = (2/3)*a-5 // - (2/3)*a-5
5-((2/3)*a)+99 = 0
(-2/3)*a+5+99 = 0
104-2/3*a = 0 // - 104
-2/3*a = -104 // : -2/3
a = -104/(-2/3)
a = 156
a = 156
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