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4=a/5-3
We move all terms to the left:
4-(a/5-3)=0
We get rid of parentheses
-a/5+3+4=0
We multiply all the terms by the denominator
-a+3*5+4*5=0
We add all the numbers together, and all the variables
-1a+35=0
We move all terms containing a to the left, all other terms to the right
-a=-35
a=-35/-1
a=+35
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