-231=-7(3+5x)

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Solution for -231=-7(3+5x) equation: 



-231=-7(3+5x)

We move all terms to the left:

-231-(-7(3+5x))=0

We add all the numbers together, and all the variables

-(-7(5x+3))-231=0



We calculate terms in parentheses: -(-7(5x+3)), so:

-7(5x+3)

We multiply parentheses

-35x-21

Back to the equation:

-(-35x-21)



We get rid of parentheses

35x+21-231=0

We add all the numbers together, and all the variables

35x-210=0

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

35x=210

x=210/35

x=6

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