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Mathematics
jhfkgulh:

Josefina started to solve for x in the equation 3.5 = 1.9 – 0.8|2x – 0.6| using the steps below: 3.5 = 1.9 – 0.8|2x – 0.6| 1.6 = –0.8|2x – 0.6| –2 = |2x – 0.6| Why did Josefina stop at Step 3?

Mercury:

major hint - the absolute value of a quantity cannot be negative