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n in (-oo:+oo)
3/4-4*n-((3/4)*n) = -187/4 // + -187/4
3/4-4*n-((3/4)*n)-(-187/4) = 0
(-3/4)*n-4*n+3/4+187/4 = 0
95/2-19/4*n = 0 // - 95/2
-19/4*n = -95/2 // : -19/4
n = -95/2/(-19/4)
n = 10
n = 10
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