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a in (-oo:+oo)
6 = (10*a)/2 // - (10*a)/2
6-((10*a)/2) = 0
6-5*a = 0
6-5*a = 0 // - 6
-5*a = -6 // : -5
a = -6/(-5)
a = 6/5
a = 6/5
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