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n in (-oo:+oo)
-7 = -n/5 // + -n/5
-(-n/5)-7 = 0
(1/5)*n-7 = 0
1/5*n-7 = 0 // + 7
1/5*n = 7 // : 1/5
n = 7/1/5
n = 35
n = 35
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