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n in (-oo:+oo)
(1/5)*n+(3/4)*n = 2 // - 2
(1/5)*n+(3/4)*n-2 = 0
19/20*n-2 = 0 // + 2
19/20*n = 2 // : 19/20
n = 2/19/20
n = 40/19
n = 40/19
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