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7=7-a/5
We move all terms to the left:
7-(7-a/5)=0
We add all the numbers together, and all the variables
-(-a/5+7)+7=0
We get rid of parentheses
a/5-7+7=0
We multiply all the terms by the denominator
a-7*5+7*5=0
We add all the numbers together, and all the variables
a=0
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