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a in (-oo:+oo)
(4/5)*a+2/3 = 58/15 // - 58/15
(4/5)*a+2/3-(58/15) = 0
(4/5)*a+2/3-58/15 = 0
4/5*a-16/5 = 0 // + 16/5
4/5*a = 16/5 // : 4/5
a = 16/5/4/5
a = 4
a = 4
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