Let's expand and simplify the expression:
5(0.5k - 1) + 2(0.4 - k)
= 2.5k - 5 + 0.8 - 2k
= 2.5k - 2k - 5 + 0.8
= 0.5k - 4.2
So the final answer in decimal form is 0.5k - 4.2.
Add: 5 (0.5k - 1) + 2 (0.4 - k). Answer should be in decimal form.
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