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a in (-oo:+oo)
(2*a)/9-((3*a)/5) = -17/3 // + -17/3
(2*a)/9-((3*a)/5)-(-17/3) = 0
(2*a)/9+(-3/5)*a+17/3 = 0
17/3-17/45*a = 0 // - 17/3
-17/45*a = -17/3 // : -17/45
a = -17/3/(-17/45)
a = 15
a = 15
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