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n in (-oo:+oo)
(9/4)*n = -9/8 // + -9/8
(9/4)*n-(-9/8) = 0
(9/4)*n+9/8 = 0
9/4*n+9/8 = 0 // - 9/8
9/4*n = -9/8 // : 9/4
n = -9/8/9/4
n = -1/2
n = -1/2
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