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a in (-oo:+oo)
a/5 = 9-(0.5*a) // - 9-(0.5*a)
a/5+0.5*a-9 = 0
0.7*a-9 = 0 // + 9
0.7*a = 9 // : 0.7
a = 9/0.7
a = 12.85714286
a = 12.85714286
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