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n in (-oo:+oo)
n/2.5-7 = -82 // + 82
n/2.5-7+82 = 0
0.4*n+75 = 0 // - 75
0.4*n = -75 // : 0.4
n = -75/0.4
n = -187.5
n = -187.5
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