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a in (-oo:+oo)
2*a+1 = 7/5 // - 7/5
2*a-(7/5)+1 = 0
2*a-7/5+1 = 0
2*a-2/5 = 0 // + 2/5
2*a = 2/5 // : 2
a = 2/5/2
a = 1/5
a = 1/5
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