Ryley H.
asked 01/08/19
find a number which decreased by 21 equals twice the opposite of the number
Philip P.
answered 01/08/19
Effective and Patient Math Tutor
Let x be the number. The opposite of the number is -x. Twice the opposite is -2x. To decrease by 21 means to subtract 21.
x - 21 = -2x
Solve for x.
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