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a in (-oo:+oo)
39 = 6*a-a-1 // - 6*a-a-1
a-(6*a)+1+39 = 0
a-6*a+1+39 = 0
40-5*a = 0 // - 40
-5*a = -40 // : -5
a = -40/(-5)
a = 8
a = 8
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