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35a+4-15a=21a+5
We move all terms to the left:
35a+4-15a-(21a+5)=0
We add all the numbers together, and all the variables
20a-(21a+5)+4=0
We get rid of parentheses
20a-21a-5+4=0
We add all the numbers together, and all the variables
-1a-1=0
We move all terms containing a to the left, all other terms to the right
-a=1
a=1/-1
a=-1
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