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(180-x)+(90+x)=210
We move all terms to the left:
(180-x)+(90+x)-(210)=0
We add all the numbers together, and all the variables
(-1x+180)+(x+90)-210=0
We get rid of parentheses
-1x+x+180+90-210=0
We add all the numbers together, and all the variables
60!=0
There is no solution for this equation
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