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n in (-oo:+oo)
(5/6)*(12*n-42) = -65 // + 65
(5/6)*(12*n-42)+65 = 0
5/6*(12*n-42)+65 = 0
5/6*(12*n-42)+65 = 0
10*n+30 = 0
10*n+30 = 0
10*n+30 = 0 // - 30
10*n = -30 // : 10
n = -30/10
n = -3
n = -3
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