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a in (-oo:+oo)
(5/7)*a+2*a+4/7 = 1/35 // - 1/35
(5/7)*a+2*a+4/7-(1/35) = 0
(5/7)*a+2*a+4/7-1/35 = 0
19/7*a+19/35 = 0 // - 19/35
19/7*a = -19/35 // : 19/7
a = -19/35/19/7
a = -1/5
a = -1/5
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