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a in (-oo:+oo)
8-((4/5)*a) = 3 // - 3
8-((4/5)*a)-3 = 0
(-4/5)*a-3+8 = 0
5-4/5*a = 0 // - 5
-4/5*a = -5 // : -4/5
a = -5/(-4/5)
a = 25/4
a = 25/4
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