How to simplify 21-(x-7)?

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Please tell me how you got the answer. Thank You. =D

2007-10-01 12:51:55 · 4 answers · asked by Wendy F 1 in Science & Mathematics ➔ Mathematics

x-7=21
x=21+7
x=28

2007-10-01 12:56:41 · answer #1 · answered by Anonymous · 0⤊ 0⤋

21 - X + 7 = 28 - X

2007-10-01 19:56:41 · answer #2 · answered by Anonymous · 0⤊ 0⤋

21 -1( x - 7)

First, distribute (multiply) the -1 to the x and then the -7

21 -x + 7

Now add the like terms and there is your answer

28 - x

2007-10-01 19:56:04 · answer #3 · answered by Anonymous · 0⤊ 0⤋

-1 times x; -1 times -7
21 - x + 7
add 21 and 7
28 - x

2007-10-01 19:55:07 · answer #4 · answered by Steve B 6 · 0⤊ 0⤋