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a in (-oo:+oo)
9-((1/3)*a) = -4 // + 4
4-((1/3)*a)+9 = 0
(-1/3)*a+4+9 = 0
13-1/3*a = 0 // - 13
-1/3*a = -13 // : -1/3
a = -13/(-1/3)
a = 39
a = 39
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