30-x=40-2x

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Solution for 30-x=40-2x equation: 



30-x=40-2x

We move all terms to the left:

30-x-(40-2x)=0

We add all the numbers together, and all the variables

-x-(-2x+40)+30=0

We add all the numbers together, and all the variables

-1x-(-2x+40)+30=0

We get rid of parentheses

-1x+2x-40+30=0

We add all the numbers together, and all the variables

x-10=0

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

x=10

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