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n in (-oo:+oo)
n/2 = (n+7)/10 // - (n+7)/10
n/2-((n+7)/10) = 0
(-1*(n+7))/10+n/2 = 0
(-1*2*(n+7))/(2*10)+(10*n)/(2*10) = 0
10*n-1*2*(n+7) = 0
8*n-14 = 0
(8*n-14)/(2*10) = 0
(8*n-14)/(2*10) = 0 // * 2*10
8*n-14 = 0
8*n-14 = 0 // + 14
8*n = 14 // : 8
n = 14/8
n = 7/4
n = 7/4
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