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a in (-oo:+oo)
(3/8)*a-4 = -17 // + 17
(3/8)*a-4+17 = 0
3/8*a+13 = 0 // - 13
3/8*a = -13 // : 3/8
a = -13/3/8
a = -104/3
a = -104/3
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