31=8w+3(7-w)

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Solution for 31=8w+3(7-w) equation: 



31=8w+3(7-w)

We move all terms to the left:

31-(8w+3(7-w))=0

We add all the numbers together, and all the variables

-(8w+3(-1w+7))+31=0



We calculate terms in parentheses: -(8w+3(-1w+7)), so:

8w+3(-1w+7)

We multiply parentheses

8w-3w+21

We add all the numbers together, and all the variables

5w+21

Back to the equation:

-(5w+21)



We get rid of parentheses

-5w-21+31=0

We add all the numbers together, and all the variables

-5w+10=0

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

-5w=-10

w=-10/-5

w=+2

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