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n in (-oo:+oo)
(-3/7)*n+(3/5)*n-7 = -2713/385 // + -2713/385
(-3/7)*n+(3/5)*n-(-2713/385)-7 = 0
(-3/7)*n+(3/5)*n+2713/385-7 = 0
6/35*n+18/385 = 0 // - 18/385
6/35*n = -18/385 // : 6/35
n = -18/385/6/35
n = -3/11
n = -3/11
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