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Joe was going to Sell all of his Stamp Collection to buy a Video game After Selling half of them he changed his mind He then bought eleven more How many did he start with if he now has 30 

 Mar 21, 2017
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x = original amount

 

1/2x  + 11 = 30   SUbtract 11 from both sides of the = sign

1/2x = 19            Multiply both sides by 2

x = 38

 Mar 21, 2017

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