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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-100 = 0
10*n-100 = 0
10*n-100 = 0 // + 100
10*n = 100 // : 10
n = 100/10
n = 10
n = 10
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