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a in (-oo:+oo)
(2/7)*a+5 = 183/35 // - 183/35
(2/7)*a-(183/35)+5 = 0
(2/7)*a-183/35+5 = 0
2/7*a-8/35 = 0 // + 8/35
2/7*a = 8/35 // : 2/7
a = 8/35/2/7
a = 4/5
a = 4/5
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