10 billions: 10 000 000 000 000 (1 bilion=12 zeroes)
Sources: My mind
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It is: (10b+7)(10b-7)
It is equivalent to: 10b-25
if x=4 (which I am assuming) 8x-10bx 8(4)-10b(4) 32-40b8(4-10b)
Any number multiplied by zero is zero. (10b also means 10 times zero.)
The equation 10b = 11 can be solved for b by dividing both sides of the equation by 10. b = 11/10 or 1.1