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a in (-oo:+oo)
-5/10 = 2*a-(3/5) // - 2*a-(3/5)
3/5-(2*a)-5/10 = 0
3/5-2*a-5/10 = 0
1/10-2*a = 0 // - 1/10
-2*a = -1/10 // : -2
a = -1/10/(-2)
a = 1/20
a = 1/20
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