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k in (-oo:+oo)
4*k-5 = 83-7*k // - 83-7*k
4*k-(-7*k)-83-5 = 0
4*k+7*k-83-5 = 0
11*k-88 = 0 // + 88
11*k = 88 // : 11
k = 88/11
k = 8
k = 8
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