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a in (-oo:+oo)
a/3+3/5 = (5*a)/9+9/8 // - (5*a)/9+9/8
a/3-((5*a)/9)+3/5-(9/8) = 0
a/3+(-5/9)*a+3/5-9/8 = 0
-2/9*a-21/40 = 0 // + 21/40
-2/9*a = 21/40 // : -2/9
a = 21/40/(-2/9)
a = -189/80
a = -189/80
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