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x in (-oo:+oo)
-5*x-(1/3) = -31/3 // + -31/3
-5*x-(1/3)-(-31/3) = 0
31/3-5*x-1/3 = 0
10-5*x = 0 // - 10
-5*x = -10 // : -5
x = -10/(-5)
x = 2
x = 2
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