(40-x)+31=52

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Solution for (40-x)+31=52 equation: 



(40-x)+31=52

We move all terms to the left:

(40-x)+31-(52)=0

We add all the numbers together, and all the variables

(-1x+40)+31-52=0

We add all the numbers together, and all the variables

(-1x+40)-21=0

We get rid of parentheses

-1x+40-21=0

We add all the numbers together, and all the variables

-1x+19=0

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

-x=-19

x=-19/-1

x=+19

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