30-x=x-10

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Solution for 30-x=x-10 equation: 



30-x=x-10

We move all terms to the left:

30-x-(x-10)=0

We add all the numbers together, and all the variables

-1x-(x-10)+30=0

We get rid of parentheses

-1x-x+10+30=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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