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a in (-oo:+oo)
(1/5)*a = 2/3 // - 2/3
(1/5)*a-(2/3) = 0
(1/5)*a-2/3 = 0
1/5*a-2/3 = 0 // + 2/3
1/5*a = 2/3 // : 1/5
a = 2/3/1/5
a = 10/3
a = 10/3
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