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k in (-oo:+oo)
5*k+1 = 2*k-35 // - 2*k-35
5*k-(2*k)+1+35 = 0
5*k-2*k+1+35 = 0
3*k+36 = 0 // - 36
3*k = -36 // : 3
k = -36/3
k = -12
k = -12
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