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(3-x)+x+(40-x)+60=500
We move all terms to the left:
(3-x)+x+(40-x)+60-(500)=0
We add all the numbers together, and all the variables
(-1x+3)+x+(-1x+40)+60-500=0
We add all the numbers together, and all the variables
x+(-1x+3)+(-1x+40)-440=0
We get rid of parentheses
x-1x-1x+3+40-440=0
We add all the numbers together, and all the variables
-1x-397=0
We move all terms containing x to the left, all other terms to the right
-x=397
x=397/-1
x=-397
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