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a in (-oo:+oo)
9-((2/5)*a) = 43/5 // - 43/5
9-((2/5)*a)-(43/5) = 0
(-2/5)*a-43/5+9 = 0
2/5-2/5*a = 0 // - 2/5
-2/5*a = -2/5 // : -2/5
a = -2/5/(-2/5)
a = 1
a = 1
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