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n in (-oo:+oo)
25-((1/2)*n) = 10 // - 10
25-((1/2)*n)-10 = 0
(-1/2)*n-10+25 = 0
15-1/2*n = 0 // - 15
-1/2*n = -15 // : -1/2
n = -15/(-1/2)
n = 30
n = 30
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