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n in (-oo:+oo)
-((3/7)*n)-9/10 = (1/2)*n-(1471/840) // - (1/2)*n-(1471/840)
1471/840-((3/7)*n)-((1/2)*n)-9/10 = 0
(-3/7)*n+(-1/2)*n-9/10+1471/840 = 0
143/168-13/14*n = 0 // - 143/168
-13/14*n = -143/168 // : -13/14
n = -143/168/(-13/14)
n = 11/12
n = 11/12
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