(3x-40)=(7x-120)=180

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Solution for (3x-40)=(7x-120)=180 equation: 



(3x-40)=(7x-120)=180

We move all terms to the left:

(3x-40)-((7x-120))=0

We get rid of parentheses

3x-((7x-120))-40=0



We calculate terms in parentheses: -((7x-120)), so:

(7x-120)

We get rid of parentheses

7x-120

Back to the equation:

-(7x-120)



We get rid of parentheses

3x-7x+120-40=0

We add all the numbers together, and all the variables

-4x+80=0

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

-4x=-80

x=-80/-4

x=+20

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