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a in (-oo:+oo)
1-(4*a) = 17 // - 17
1-(4*a)-17 = 0
1-4*a-17 = 0
-4*a-16 = 0 // + 16
-4*a = 16 // : -4
a = 16/(-4)
a = -4
a = -4
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