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a in (-oo:+oo)
7.3 = a/5+1/2 // - a/5+1/2
7.3-(a/5)-(1/2) = 0
7.3-(a/5)-1/2 = 0
6.8-1/5*a = 0 // - 6.8
-1/5*a = -6.8 // : -1/5
a = -6.8/(-1/5)
a = 34
a = 34
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