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n in (-oo:+oo)
(3/4)*n = -18-1.75 // + -18-1.75
(3/4)*n+1.75+18 = 0
3/4*n+19.75 = 0 // - 19.75
3/4*n = -19.75 // : 3/4
n = -19.75/3/4
n = -26.33333333
n = -26.33333333
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