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a in (-oo:+oo)
3-((4/5)*a) = -5 // + 5
3-((4/5)*a)+5 = 0
(-4/5)*a+3+5 = 0
8-4/5*a = 0 // - 8
-4/5*a = -8 // : -4/5
a = -8/(-4/5)
a = 10
a = 10
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