The product of a number minus ten and nine equals fifty when decreased by seven. which equation represents the sentence?

a. 7 (x - 10) - 9 = 50

b. 7 (10 - x) - 9 = 50

c. 9 (x - 10) - 7 = 50

d. 9 (10 - x) - 7 = 50

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