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n in (-oo:+oo)
n/4.2+5 = -4 // + 4
n/4.2+4+5 = 0
0.23809524*n+9 = 0 // - 9
0.23809524*n = -9 // : 0.23809524
n = -9/0.23809524
n = -37.7999997
n = -37.7999997
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