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a in (-oo:+oo)
2*a-(2/5) = 6 // - 6
2*a-(2/5)-6 = 0
2*a-2/5-6 = 0
2*a-32/5 = 0 // + 32/5
2*a = 32/5 // : 2
a = 32/5/2
a = 16/5
a = 16/5
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