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n in (-oo:+oo)
(-1/3)*n+(3/4)*n+1 = 47/42 // - 47/42
(-1/3)*n+(3/4)*n-(47/42)+1 = 0
(-1/3)*n+(3/4)*n-47/42+1 = 0
5/12*n-5/42 = 0 // + 5/42
5/12*n = 5/42 // : 5/12
n = 5/42/5/12
n = 2/7
n = 2/7
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