dawnsoderstrom dawnsoderstrom

24-08-2017
Mathematics

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3 times the difference of a number and 7 is 18

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texaschic101 texaschic101

24-08-2017

" the difference " means subtract

3(n - 7) = 18
3n - 21 = 18
3n = 18 + 21
3n = 39
n = 39/3
n = 13 <== ur number

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