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