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x + y =11
100x+10y+7=10x+y+511
x + y =11|*9
90x-9y=504
9x+9y=99
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99x=603
x=6¹/₁₁
6¹/₁₁+y=11
y=4¹⁰/₁₁
x + y =11
100x + 10y+ 7 =1 0x+ y + 511
x + y = 11|*9
90x - 9y = 504
9x + 9y = 99
99x = 603
x=6¹/₁₁
6¹/₁₁+y=11
y=4¹⁰/₁₁