a+5/6- a+1/9= a+3/4
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A+5/6- a+1/9= a+3/4
3a= 3/4+5/6+1/9
3*3-2*5/12+1/9
9-10/12+1/9
-1/12 +1/9
-1*3+1*4/36
3a=-1/36
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