x+x=x-30

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Solution for x+x=x-30 equation: 



x+x=x-30

We move all terms to the left:

x+x-(x-30)=0

We add all the numbers together, and all the variables

2x-(x-30)=0

We get rid of parentheses

2x-x+30=0

We add all the numbers together, and all the variables

x+30=0

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

x=-30

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