(40-x)+3=31

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Solution for (40-x)+3=31 equation: 



(40-x)+3=31

We move all terms to the left:

(40-x)+3-(31)=0

We add all the numbers together, and all the variables

(-1x+40)+3-31=0

We add all the numbers together, and all the variables

(-1x+40)-28=0

We get rid of parentheses

-1x+40-28=0

We add all the numbers together, and all the variables

-1x+12=0

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

-x=-12

x=-12/-1

x=+12

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