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900-x=720-x
We move all terms to the left:
900-x-(720-x)=0
We add all the numbers together, and all the variables
-x-(-1x+720)+900=0
We add all the numbers together, and all the variables
-1x-(-1x+720)+900=0
We get rid of parentheses
-1x+1x-720+900=0
We add all the numbers together, and all the variables
180!=0
There is no solution for this equation
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