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n in (-oo:+oo)
-((1/4)*n)-13 = 7 // - 7
-((1/4)*n)-13-7 = 0
(-1/4)*n-13-7 = 0
-1/4*n-20 = 0 // + 20
-1/4*n = 20 // : -1/4
n = 20/(-1/4)
n = -80
n = -80
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