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k in (-oo:+oo)
-(2*k)-2/7 = 41/77-3*k // - 41/77-3*k
-(2*k)-(-3*k)-2/7-(41/77) = 0
3*k-2*k-2/7-41/77 = 0
k-9/11 = 0 // + 9/11
k = 9/11
k = 9/11
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