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k in (-oo:+oo)
7*k-((3/7)*k)+6 = 52 // - 52
7*k-((3/7)*k)-52+6 = 0
7*k+(-3/7)*k-52+6 = 0
46/7*k-46 = 0 // + 46
46/7*k = 46 // : 46/7
k = 46/46/7
k = 7
k = 7
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