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(90-x)+x=500
We move all terms to the left:
(90-x)+x-(500)=0
We add all the numbers together, and all the variables
(-1x+90)+x-500=0
We add all the numbers together, and all the variables
x+(-1x+90)-500=0
We get rid of parentheses
x-1x+90-500=0
We add all the numbers together, and all the variables
-410!=0
There is no solution for this equation
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