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n in (-oo:+oo)
7-((1/4)*n) = 15 // - 15
7-((1/4)*n)-15 = 0
(-1/4)*n-15+7 = 0
-1/4*n-8 = 0 // + 8
-1/4*n = 8 // : -1/4
n = 8/(-1/4)
n = -32
n = -32
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