(20-y)+y=20

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Solution for (20-y)+y=20 equation: 



(20-y)+y=20

We move all terms to the left:

(20-y)+y-(20)=0

We add all the numbers together, and all the variables

(-1y+20)+y-20=0

We add all the numbers together, and all the variables

y+(-1y+20)-20=0

We get rid of parentheses

y-1y+20-20=0

We add all the numbers together, and all the variables

=0

y=0/1

y=0

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