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a in (-oo:+oo)
2*a-(1/5) = 8 // - 8
2*a-(1/5)-8 = 0
2*a-1/5-8 = 0
2*a-41/5 = 0 // + 41/5
2*a = 41/5 // : 2
a = 41/5/2
a = 41/10
a = 41/10
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