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a in (-oo:+oo)
(4/10)*a = 3/5 // - 3/5
(4/10)*a-(3/5) = 0
(4/10)*a-3/5 = 0
2/5*a-3/5 = 0 // + 3/5
2/5*a = 3/5 // : 2/5
a = 3/5/2/5
a = 3/2
a = 3/2
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