(x-20)+110+130+120+(x-40)+(x-20)=720

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Solution for (x-20)+110+130+120+(x-40)+(x-20)=720 equation: 



(x-20)+110+130+120+(x-40)+(x-20)=720

We move all terms to the left:

(x-20)+110+130+120+(x-40)+(x-20)-(720)=0

We add all the numbers together, and all the variables

(x-20)+(x-40)+(x-20)-360=0

We get rid of parentheses

x+x+x-20-40-20-360=0

We add all the numbers together, and all the variables

3x-440=0

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

3x=440

x=440/3

x=146+2/3

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