Answer:
Your answer is 116
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The easiest way is if it doesn't need to be simplified. Multiply -2.105 by

. You get the fraction

. While this is technically the answer, you can simplify this down to

. Because 421 is a prime number, this can not be simplified any further. Therefore, the solution is

.

.
my brother did that too but I'm sorry i cant help you but I'm gonna say just keep up the good work