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1=-2a-4+a
We move all terms to the left:
1-(-2a-4+a)=0
We add all the numbers together, and all the variables
-(-1a-4)+1=0
We get rid of parentheses
1a+4+1=0
We add all the numbers together, and all the variables
a+5=0
We move all terms containing a to the left, all other terms to the right
a=-5
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