40-x=21+x

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Solution for 40-x=21+x equation: 



40-x=21+x

We move all terms to the left:

40-x-(21+x)=0

We add all the numbers together, and all the variables

-x-(x+21)+40=0

We add all the numbers together, and all the variables

-1x-(x+21)+40=0

We get rid of parentheses

-1x-x-21+40=0

We add all the numbers together, and all the variables

-2x+19=0

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

-2x=-19

x=-19/-2

x=9+1/2

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