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180-a=40-a
We move all terms to the left:
180-a-(40-a)=0
We add all the numbers together, and all the variables
-a-(-1a+40)+180=0
We add all the numbers together, and all the variables
-1a-(-1a+40)+180=0
We get rid of parentheses
-1a+1a-40+180=0
We add all the numbers together, and all the variables
140!=0
There is no solution for this equation
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