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90-d=180-d
We move all terms to the left:
90-d-(180-d)=0
We add all the numbers together, and all the variables
-d-(-1d+180)+90=0
We add all the numbers together, and all the variables
-1d-(-1d+180)+90=0
We get rid of parentheses
-1d+1d-180+90=0
We add all the numbers together, and all the variables
-90!=0
There is no solution for this equation
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