Emergency! If a = 1, find the values of b, c, and d that make the given expression equivalent to the expression below.

Expression Given: (3x^(2)+2x-21)/(-2x^(2)-2x+12)*(2x^ (3)+25x+63)/(6x^(2)+7x-49)

Expression that need to equal to the given one: (ax + b) / (cx + d)

a= 1

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