31-7x=4(7-2x)

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Solution for 31-7x=4(7-2x) equation: 



31-7x=4(7-2x)

We move all terms to the left:

31-7x-(4(7-2x))=0

We add all the numbers together, and all the variables

-7x-(4(-2x+7))+31=0



We calculate terms in parentheses: -(4(-2x+7)), so:

4(-2x+7)

We multiply parentheses

-8x+28

Back to the equation:

-(-8x+28)



We get rid of parentheses

-7x+8x-28+31=0

We add all the numbers together, and all the variables

x+3=0

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

x=-3

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