There are an infinite number of solutions.
Blank1 = 1 and blank2 = 15
B1 = -1 and B2 = -15
B1 = 2 and B2 = 7.5
B1 = 3 and B2 = 5
B1 = 1.1 and B2 = 15/1.1 etc, etc.
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3 x 5 x 5 = 75
1 x 75, 3 x 25, 5 x 15.
x = 75
There's only one single number that equals 75. That number is 75, and it's not a prime number. If you mean which prime numbers multiplied together equal 75, 52 X 3 works.
Assuming your equation looks like this x÷5 = 15 then x = 15*5 x= 75