x+(x+200)=300

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Solution for x+(x+200)=300 equation: 



x+(x+200)=300

We move all terms to the left:

x+(x+200)-(300)=0

We get rid of parentheses

x+x+200-300=0

We add all the numbers together, and all the variables

2x-100=0

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

2x=100

x=100/2

x=50

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