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n in (-oo:+oo)
(3*n)/2 = -9/10 // + -9/10
(3*n)/2-(-9/10) = 0
(3*n)/2+9/10 = 0
3/2*n+9/10 = 0 // - 9/10
3/2*n = -9/10 // : 3/2
n = -9/10/3/2
n = -3/5
n = -3/5
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