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n in (-oo:+oo)
-((2/3)*n)-1/3 = -7/15 // + -7/15
-((2/3)*n)-1/3-(-7/15) = 0
(-2/3)*n-1/3+7/15 = 0
2/15-2/3*n = 0 // - 2/15
-2/3*n = -2/15 // : -2/3
n = -2/15/(-2/3)
n = 1/5
n = 1/5
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