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