x+(x+20)+(x-20)=210

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Solution for x+(x+20)+(x-20)=210 equation: 



x+(x+20)+(x-20)=210

We move all terms to the left:

x+(x+20)+(x-20)-(210)=0

We get rid of parentheses

x+x+x+20-20-210=0

We add all the numbers together, and all the variables

3x-210=0

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

3x=210

x=210/3

x=70

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