13) 2x + 5 = 2x + 11 ⇒ the 2x cancels out on both sides leaving 5 = 11 which is a false statement so there is no solution that will make it a true statement.
14) -11k + 14 = -11k - 25 ⇒ same as above. the -11k cancels out leaving 14 = -25
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