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a in (-oo:+oo)
(3/7)*a-4/5 = 137/35 // - 137/35
(3/7)*a-4/5-(137/35) = 0
(3/7)*a-4/5-137/35 = 0
3/7*a-33/7 = 0 // + 33/7
3/7*a = 33/7 // : 3/7
a = 33/7/3/7
a = 11
a = 11
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