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k in (-oo:+oo)
2*k+2 = 79-5*k // - 79-5*k
2*k-(-5*k)-79+2 = 0
2*k+5*k-79+2 = 0
7*k-77 = 0 // + 77
7*k = 77 // : 7
k = 77/7
k = 11
k = 11
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