(3x-20)+(3x-20)+4x+4x+(3x-20)+(3x-20)=720

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Solution for (3x-20)+(3x-20)+4x+4x+(3x-20)+(3x-20)=720 equation: 



(3x-20)+(3x-20)+4x+4x+(3x-20)+(3x-20)=720

We move all terms to the left:

(3x-20)+(3x-20)+4x+4x+(3x-20)+(3x-20)-(720)=0

We add all the numbers together, and all the variables

8x+(3x-20)+(3x-20)+(3x-20)+(3x-20)-720=0

We get rid of parentheses

8x+3x+3x+3x+3x-20-20-20-20-720=0

We add all the numbers together, and all the variables

20x-800=0

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

20x=800

x=800/20

x=40

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