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