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n in (-oo:+oo)
7/10-5*n = -11/20 // + -11/20
7/10-5*n-(-11/20) = 0
7/10-5*n+11/20 = 0
5/4-5*n = 0 // - 5/4
-5*n = -5/4 // : -5
n = -5/4/(-5)
n = 1/4
n = 1/4
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