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a in (-oo:+oo)
3*a-a+1 = 3/5 // - 3/5
3*a-a-(3/5)+1 = 0
3*a-a-3/5+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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