4 answers
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Again, I am not crazy about your second line, since you are solving equations, I don't see one.
I suggest this if you have to show your steps
-6q + 5.8 = 23.8
-6q + 5.8 - 5.8 = 23.8 - 5.8
-6q = 18
-6q-6 = 18/-6
q = -3