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n in (-oo:+oo)
3.6 = (3*n)/10 // - (3*n)/10
3.6-((3*n)/10) = 0
(-3/10)*n+3.6 = 0
3.6-3/10*n = 0 // - 3.6
-3/10*n = -3.6 // : -3/10
n = -3.6/(-3/10)
n = 12
n = 12
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