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solve -[-(-k)]-(-2)(-2+k)=-k-(4k+3)

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"clean up" all those negative signs first.

-[-(-k)]-(-2)(-2+k)=-k-(4k+3)
-k + 2(-2+k) = -k - 4k - 3
-k - 4 + 2k = -5k - 3
6k = 1
k = 1/6

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