Janelle S. answered 09/24/20
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Penn State Grad for ME, Math & Test Prep Tutoring (10+ yrs experience)
JK = JL - KL = (3x - 1) - 2 = 3x - 3
LM = KM - KL = (3x-2) - 2 = 3x - 4
JK + LM = (3x - 3) + (3x - 4) = 6x - 7