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a in (-oo:+oo)
71/105 = a+(3/7)*a+1/5 // - a+(3/7)*a+1/5
71/105-a-((3/7)*a)-(1/5) = 0
(-3/7)*a-a+71/105-1/5 = 0
10/21-10/7*a = 0 // - 10/21
-10/7*a = -10/21 // : -10/7
a = -10/21/(-10/7)
a = 1/3
a = 1/3
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