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n in (-oo:+oo)
-((2/7)*n)-1/8 = -151/56 // + -151/56
-((2/7)*n)-1/8-(-151/56) = 0
(-2/7)*n-1/8+151/56 = 0
18/7-2/7*n = 0 // - 18/7
-2/7*n = -18/7 // : -2/7
n = -18/7/(-2/7)
n = 9
n = 9
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