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n in (-oo:+oo)
13-((1/4)*n) = 10 // - 10
13-((1/4)*n)-10 = 0
(-1/4)*n-10+13 = 0
3-1/4*n = 0 // - 3
-1/4*n = -3 // : -1/4
n = -3/(-1/4)
n = 12
n = 12
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