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a in (-oo:+oo)
161/165 = a+(3/5)*a-(1/3) // - a+(3/5)*a-(1/3)
161/165-a-((3/5)*a)+1/3 = 0
(-3/5)*a-a+161/165+1/3 = 0
72/55-8/5*a = 0 // - 72/55
-8/5*a = -72/55 // : -8/5
a = -72/55/(-8/5)
a = 9/11
a = 9/11
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