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n in (-oo:+oo)
3*n-(7/(-2)) = -0.25*n // + -0.25*n
3*n-(-0.25*n)-(7/(-2)) = 0
3*n+0.25*n+7/2 = 0
3.25*n+7/2 = 0 // - 7/2
3.25*n = -7/2 // : 3.25
n = -7/2/3.25
n = -1.07692308
n = -1.07692308
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