a number consists of two digita. if 7 is added to the sum of the two digits, the result will be the th
ree times the left hand digit and if 8 is substracted from the number the digits are interchanged. the number is
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x+y+7=3x
2x=y+7
10x+y-8=10y+x
9x-8=9y
9x-8=18x-63
9x=55
x=55/9
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