x+(x+140)=520

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Solution for x+(x+140)=520 equation: 



x+(x+140)=520

We move all terms to the left:

x+(x+140)-(520)=0

We get rid of parentheses

x+x+140-520=0

We add all the numbers together, and all the variables

2x-380=0

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

2x=380

x=380/2

x=190

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