(4x+5)+(5x-20)=180

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Solution for (4x+5)+(5x-20)=180 equation: 



(4x+5)+(5x-20)=180

We move all terms to the left:

(4x+5)+(5x-20)-(180)=0

We get rid of parentheses

4x+5x+5-20-180=0

We add all the numbers together, and all the variables

9x-195=0

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

9x=195

x=195/9

x=21+2/3

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