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a in (-oo:+oo)
(3/7)*a+7*a+3/5 = 73/35 // - 73/35
(3/7)*a+7*a+3/5-(73/35) = 0
(3/7)*a+7*a+3/5-73/35 = 0
52/7*a-52/35 = 0 // + 52/35
52/7*a = 52/35 // : 52/7
a = 52/35/52/7
a = 1/5
a = 1/5
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