x+(x+20)+3(x+(x+20))=688

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Solution for x+(x+20)+3(x+(x+20))=688 equation: 



x+(x+20)+3(x+(x+20))=688

We move all terms to the left:

x+(x+20)+3(x+(x+20))-(688)=0

We get rid of parentheses

x+x+3(x+(x+20))+20-688=0

We add all the numbers together, and all the variables

2x+3(x+(x+20))-668=0

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

2x+3(x+(x+20))=668

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