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-1a-2-3a+4=-2a
We move all terms to the left:
-1a-2-3a+4-(-2a)=0
We add all the numbers together, and all the variables
-4a-(-2a)+2=0
We get rid of parentheses
-4a+2a+2=0
We add all the numbers together, and all the variables
-2a+2=0
We move all terms containing a to the left, all other terms to the right
-2a=-2
a=-2/-2
a=1
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