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x+y = 12
10y+x = 10x+y+18
=> 9y-9x = 18
x+y = 12(*9)
9x+9y = 108
-9x+9y =18
18x = 126
x = 7
y = 108-(9*7)
y = 45
number = 10*7 + 45
=70+45
115
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