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-4=-3-a
We move all terms to the left:
-4-(-3-a)=0
We add all the numbers together, and all the variables
-(-1a-3)-4=0
We get rid of parentheses
1a+3-4=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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