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If we assume that "r" is unknown:

-9r+8 or 8-9r

It cannot be simplified further.

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8x9= 72r

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Q: What is 8 minus the product of 9 and r?
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Is r equals 9 a solution of 128 equals 16r?

No, it is not. Substitute and check. You have 128 + 16r. So now, if r=9, then the equation would be 128 = 16x9. But, 16x9 is 145 and is not equal to 128. Thus, r=9 is not the solution. The solution is r+ 128/16 which is equal to 8. Thus, the actual solution is r = 8.


How many combinations of 8 numbers are possible from 10 numbers?

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