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Can some one show how to solve this? The answer is 10
-x-1=x-21 Add 1 to each side -x-1+1=x-21+1 -x=x-20 Minus x from each side -x-x=x-x-20 -2x=-20 Divide -20 by -2x If two negatives are divided, it becomes a positive number -20÷-2x=10 x=10
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