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a in (-oo:+oo)
a/9-((2*a)/5) = -13/3 // + -13/3
a/9-((2*a)/5)-(-13/3) = 0
a/9+(-2/5)*a+13/3 = 0
13/3-13/45*a = 0 // - 13/3
-13/45*a = -13/3 // : -13/45
a = -13/3/(-13/45)
a = 15
a = 15
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