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a in (-oo:+oo)
a-(5*a)+1/5 = 141/5 // - 141/5
a-(5*a)+1/5-(141/5) = 0
a-5*a+1/5-141/5 = 0
-4*a-28 = 0 // + 28
-4*a = 28 // : -4
a = 28/(-4)
a = -7
a = -7
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