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The sum of 10 times a number and 15 is added to 11 times the same number.
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The sum of 10 times a number and 15 is added to 11 times the same number.

User Mihai Georgescu
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10xX+15 =11X
10X+15=11X
-10X -10X
15=1X

X=15
User Bicbmx
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