(40-x)+x=40

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Solution for (40-x)+x=40 equation: 



(40-x)+x=40

We move all terms to the left:

(40-x)+x-(40)=0

We add all the numbers together, and all the variables

(-1x+40)+x-40=0

We add all the numbers together, and all the variables

x+(-1x+40)-40=0

We get rid of parentheses

x-1x+40-40=0

We add all the numbers together, and all the variables

=0

x=0/1

x=0

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