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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.
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