For E to be the midpoint of DF, it needs to divide DF in 2 equal segments, DE and EF. If E is the midpoint of DF, then DE and EF are equal, so the reason is that the expressions for DE and EF are equal. The reason is:
9c + 4 = -23
9c = -27
c = -3
Answer: x=3y+6
Explanation to solve:
You must move all terms not containing x to the right side of the equation!
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