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k in (-oo:+oo)
-29 = 2*k+2*k+7 // - 2*k+2*k+7
-(2*k)-(2*k)-29-7 = 0
-2*k-2*k-29-7 = 0
-4*k-36 = 0 // + 36
-4*k = 36 // : -4
k = 36/(-4)
k = -9
k = -9
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