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