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a in (-oo:+oo)
(8/5)*a = 4/3 // - 4/3
(8/5)*a-(4/3) = 0
(8/5)*a-4/3 = 0
8/5*a-4/3 = 0 // + 4/3
8/5*a = 4/3 // : 8/5
a = 4/3/8/5
a = 5/6
a = 5/6
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