(8-x)+4=21

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Solution for (8-x)+4=21 equation: 



(8-x)+4=21

We move all terms to the left:

(8-x)+4-(21)=0

We add all the numbers together, and all the variables

(-1x+8)+4-21=0

We add all the numbers together, and all the variables

(-1x+8)-17=0

We get rid of parentheses

-1x+8-17=0

We add all the numbers together, and all the variables

-1x-9=0

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

-x=9

x=9/-1

x=-9

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