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n in (-oo:+oo)
0 = 30-((3/4)*n) // - 30-((3/4)*n)
(3/4)*n-30+0 = 0
(3/4)*n-30 = 0
3/4*n-30 = 0 // + 30
3/4*n = 30 // : 3/4
n = 30/3/4
n = 40
n = 40
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