-340=7x+3(7x-20)

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Solution for -340=7x+3(7x-20) equation: 



-340=7x+3(7x-20)

We move all terms to the left:

-340-(7x+3(7x-20))=0



We calculate terms in parentheses: -(7x+3(7x-20)), so:

7x+3(7x-20)

We multiply parentheses

7x+21x-60

We add all the numbers together, and all the variables

28x-60

Back to the equation:

-(28x-60)



We get rid of parentheses

-28x+60-340=0

We add all the numbers together, and all the variables

-28x-280=0

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

-28x=280

x=280/-28

x=-10

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