40=7x-2(-x+7)

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Solution for 40=7x-2(-x+7) equation: 



40=7x-2(-x+7)

We move all terms to the left:

40-(7x-2(-x+7))=0

We add all the numbers together, and all the variables

-(7x-2(-1x+7))+40=0



We calculate terms in parentheses: -(7x-2(-1x+7)), so:

7x-2(-1x+7)

We multiply parentheses

7x+2x-14

We add all the numbers together, and all the variables

9x-14

Back to the equation:

-(9x-14)



We get rid of parentheses

-9x+14+40=0

We add all the numbers together, and all the variables

-9x+54=0

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

-9x=-54

x=-54/-9

x=+6

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