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a in (-oo:+oo)
-(2*a)-3 = -17 // + 17
17-(2*a)-3 = 0
17-2*a-3 = 0
14-2*a = 0 // - 14
-2*a = -14 // : -2
a = -14/(-2)
a = 7
a = 7
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