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k in (-oo:+oo)
6*(7*k+9) = 180 // - 180
6*(7*k+9)-180 = 0
6*(7*k+9)-180 = 0
42*k-126 = 0
42*k-126 = 0
42*k-126 = 0 // + 126
42*k = 126 // : 42
k = 126/42
k = 3
k = 3
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