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Which one of the following expressions is equal to
#frac{5(2a-3b)+5(a+5b)}{3(4a-3b)+3(a+4b)}#
A.#frac{15a+10b}{15a+3b}#

B.#frac{5+25b}{6+12b}#

C.#frac{15a+40b}{15a+21b}#

D.#frac{15a+2b}{15a}+b#