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When i double me number and add ten.i get my number plus nine

When i double me number and add ten.i get my number plus nine
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When i double me number and add ten.i get my number plus nine

User Shakked
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x is your number...... 2x+10=x+9 . . . . /-x. ......... x+10=9 . . . . . /-10......... x=-1
User SWilk
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