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a in (-oo:+oo)
12-((4/5)*a) = 5 // - 5
12-((4/5)*a)-5 = 0
(-4/5)*a-5+12 = 0
7-4/5*a = 0 // - 7
-4/5*a = -7 // : -4/5
a = -7/(-4/5)
a = 35/4
a = 35/4
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