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n in (-oo:+oo)
(1/5)*n+3/4 = 1/2 // - 1/2
(1/5)*n+3/4-(1/2) = 0
(1/5)*n+3/4-1/2 = 0
1/5*n+1/4 = 0 // - 1/4
1/5*n = -1/4 // : 1/5
n = -1/4/1/5
n = -5/4
n = -5/4
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