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n in (-oo:+oo)
(-2/3)*n = -13 // + 13
(-2/3)*n+13 = 0
13-2/3*n = 0 // - 13
-2/3*n = -13 // : -2/3
n = -13/(-2/3)
n = 39/2
n = 39/2
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