Quick math help

In which step below does a mistake first appear in simplifying the expression?

0.5(-12c+6)-3(c+4)+10(c-5)

Step 1: -6c+3-3(c+4)+10(c-5)
Step 2: -6c+3-3c-12+10(c-5)
Step 3: -6c+3-3c-12+10c-50
Step 4: 7c-41

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