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n in (-oo:+oo)
(-3/4)*n-((1/8)*n) = -21/64 // + -21/64
(-3/4)*n-((1/8)*n)-(-21/64) = 0
(-3/4)*n+(-1/8)*n+21/64 = 0
21/64-7/8*n = 0 // - 21/64
-7/8*n = -21/64 // : -7/8
n = -21/64/(-7/8)
n = 3/8
n = 3/8
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