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a in (-oo:+oo)
34 = 4*a+a-1 // - 4*a+a-1
1-(4*a)-a+34 = 0
1-4*a-a+34 = 0
35-5*a = 0 // - 35
-5*a = -35 // : -5
a = -35/(-5)
a = 7
a = 7
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