x+(x+20)+(x+70)=180

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Solution for x+(x+20)+(x+70)=180 equation: 



x+(x+20)+(x+70)=180

We move all terms to the left:

x+(x+20)+(x+70)-(180)=0

We get rid of parentheses

x+x+x+20+70-180=0

We add all the numbers together, and all the variables

3x-90=0

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

3x=90

x=90/3

x=30

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