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K - 2L = L - M

Subtract L from both sides:

K - 2L - L = -M

Add M to both sides:

K - 2L - L + M = 0

Add 2L to both sides:

K - L + M = 2L <== this is the answer

Hope This Helps You!

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↬ ʜᴀɴɴᴀʜ

K+ M= L 2L
K +M- L= 2L