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