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n in (-oo:+oo)
(-5/7)*((5/7)*n+11/2) = 0
-5/7*(5/7*n+11/2) = 0
5/7*n+11/2 = 0 // - 11/2
5/7*n = -11/2 // : 5/7
n = -11/2/5/7
n = -77/10
n = -77/10
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