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-7=a/0-3
We move all terms to the left:
-7-(a/0-3)=0
We get rid of parentheses
-a/0+3-7=0
We multiply all the terms by the denominator
-a+3*0-7*0=0
We add all the numbers together, and all the variables
-a=0
a=0/-1
a=0
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