21-(12-x)=20

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Solution for 21-(12-x)=20 equation: 



21-(12-x)=20

We move all terms to the left:

21-(12-x)-(20)=0

We add all the numbers together, and all the variables

-(-1x+12)+21-20=0

We add all the numbers together, and all the variables

-(-1x+12)+1=0

We get rid of parentheses

1x-12+1=0

We add all the numbers together, and all the variables

x-11=0

We move all terms containing x to the left, all other terms to the right

x=11

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