x+19=3x-21

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Solution for x+19=3x-21 equation: 



x+19=3x-21

We move all terms to the left:

x+19-(3x-21)=0

We get rid of parentheses

x-3x+21+19=0

We add all the numbers together, and all the variables

-2x+40=0

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

-2x=-40

x=-40/-2

x=+20

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