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6-4a=5-5a
We move all terms to the left:
6-4a-(5-5a)=0
We add all the numbers together, and all the variables
-4a-(-5a+5)+6=0
We get rid of parentheses
-4a+5a-5+6=0
We add all the numbers together, and all the variables
a+1=0
We move all terms containing a to the left, all other terms to the right
a=-1
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