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n in (-oo:+oo)
(3/4)*n-(1/5) = (7/10)*n+1/2 // - (7/10)*n+1/2
(3/4)*n-((7/10)*n)-(1/5)-(1/2) = 0
(3/4)*n+(-7/10)*n-1/5-1/2 = 0
1/20*n-7/10 = 0 // + 7/10
1/20*n = 7/10 // : 1/20
n = 7/10/1/20
n = 14
n = 14
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