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k in (-oo:+oo)
22 = 2*k+k+10 // - 2*k+k+10
22-(2*k)-k-10 = 0
22-2*k-k-10 = 0
12-3*k = 0 // - 12
-3*k = -12 // : -3
k = -12/(-3)
k = 4
k = 4
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