19=40-3x

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Solution for 19=40-3x equation: 



19=40-3x

We move all terms to the left:

19-(40-3x)=0

We add all the numbers together, and all the variables

-(-3x+40)+19=0

We get rid of parentheses

3x-40+19=0

We add all the numbers together, and all the variables

3x-21=0

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

3x=21

x=21/3

x=7

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