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n in (-oo:+oo)
n-6 = (7/5)*n-42 // - (7/5)*n-42
n-((7/5)*n)-6+42 = 0
n+(-7/5)*n-6+42 = 0
36-2/5*n = 0 // - 36
-2/5*n = -36 // : -2/5
n = -36/(-2/5)
n = 90
n = 90
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