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a in (-oo:+oo)
1/2-3*a = 23/10 // - 23/10
1/2-3*a-(23/10) = 0
1/2-3*a-23/10 = 0
-3*a-9/5 = 0 // + 9/5
-3*a = 9/5 // : -3
a = 9/5/(-3)
a = -3/5
a = -3/5
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