OG详解-OG7 数学1 Q33

The correct answer is 294. Subtracting 18 from each side of the given equation yields 6​7​ p = 36.  Multiplying each side of this equation by 7​6​ yields p = 42. Multiplying each side of this equation by 7 yields 7p = 294. Therefore, the value of 7p is 294.