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n in (-oo:+oo)
-((2/5)*n)-8 = 7*n-8 // - 7*n-8
8-((2/5)*n)-(7*n)-8 = 0
(-2/5)*n-7*n-8+8 = 0
-37/5*n = 0 // : -37/5
n = 0
n = 0
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