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n in (-oo:+oo)
3*n-(4.2/4) = -4.8 // + 4.8
3*n-(4.2/4)+4.8 = 0
3*n-1.05+4.8 = 0
3*n+3.75 = 0 // - 3.75
3*n = -3.75 // : 3
n = -3.75/3
n = -1.25
n = -1.25
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