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