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n in (-oo:+oo)
-13 = -n/3 // + -n/3
-(-n/3)-13 = 0
(1/3)*n-13 = 0
1/3*n-13 = 0 // + 13
1/3*n = 13 // : 1/3
n = 13/1/3
n = 39
n = 39
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