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a in (-oo:+oo)
(13/3)*a-4 = -1 // + 1
(13/3)*a-4+1 = 0
13/3*a-3 = 0 // + 3
13/3*a = 3 // : 13/3
a = 3/13/3
a = 9/13
a = 9/13
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