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n in (-oo:+oo)
(3/2)*n-((15/4)*n) = -1/2 // + -1/2
(3/2)*n-((15/4)*n)-(-1/2) = 0
(3/2)*n+(-15/4)*n+1/2 = 0
1/2-9/4*n = 0 // - 1/2
-9/4*n = -1/2 // : -9/4
n = -1/2/(-9/4)
n = 2/9
n = 2/9
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