Let m = 2x + 3. Which equation is equivalent to (2x + 3)^2 – 14x - 21 = -6 in terms of m?

a)m^2+7m+6=0
b)m^2+7m-15=0
c)m^2-7m-15=0
d)m^2-7m+6=0​

Select the correct answer from each drop down menu

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