(7x-1)+(13x+21)=180

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Solution for (7x-1)+(13x+21)=180 equation: 



(7x-1)+(13x+21)=180

We move all terms to the left:

(7x-1)+(13x+21)-(180)=0

We get rid of parentheses

7x+13x-1+21-180=0

We add all the numbers together, and all the variables

20x-160=0

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

20x=160

x=160/20

x=8

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