the unit digit of a two digit number is 3 and seven times the sum of the digit is the number itself find the number
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7(x+3) = 10x+3
7x+21=10x+3
10x-7x=21-3
3x= 18
x = 6
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Answer
7(x+3)=10x+3
7x+21=10x+3
21-3=10x-7x
3x=18
x=6
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