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a in (-oo:+oo)
5-3*a = 7/2 // - 7/2
5-3*a-(7/2) = 0
5-3*a-7/2 = 0
3/2-3*a = 0 // - 3/2
-3*a = -3/2 // : -3
a = -3/2/(-3)
a = 1/2
a = 1/2
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